Found 35 papers in cond-mat
Date of feed: Mon, 11 Sep 2023 00:30:00 GMT

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Time- and Angle-Resolved Photoemission Studies of Quantum Materials. (arXiv:2309.03935v1 [cond-mat.str-el])
Fabio Boschini, Marta Zonno, Andrea Damascelli

Angle-resolved photoemission spectroscopy (ARPES) -- with its exceptional sensitivity to both the binding energy and momentum of valence electrons in solids -- provides unparalleled insights into the electronic structure of quantum materials. Over the last two decades, the advent of femtosecond lasers, which can deliver ultrashort and coherent light pulses, has ushered the ARPES technique into the time domain. Now, time-resolved ARPES (TR-ARPES) can probe ultrafast electron dynamics and the out-of-equilibrium electronic structure, providing a wealth of information otherwise unattainable in conventional ARPES experiments. This paper begins with an introduction to the theoretical underpinnings of TR-ARPES followed by a description of recent advances in state-of-the-art ultrafast sources and optical excitation schemes. It then reviews paradigmatic phenomena investigated by TR-ARPES thus far, such as out-of-equilibrium electronic states and their spin dynamics, Floquet-Volkov states, photoinduced phase transitions, electron-phonon coupling, and surface photovoltage effects. Each section highlights TR-ARPES data from diverse classes of quantum materials, including semiconductors, charge-ordered systems, topological materials, excitonic insulators, van der Waals materials, and unconventional superconductors. These examples demonstrate how TR-ARPES has played a critical role in unraveling the complex dynamical properties of quantum materials. The conclusion outlines possible future directions and opportunities for this powerful technique.


Disorder in the non-linear anomalous Hall effect of $\mathcal{P}\mathcal{T}$-symmetric Dirac fermions. (arXiv:2309.03947v1 [cond-mat.mes-hall])
Rhonald Burgos Atencia, Di Xiao, Dimitrie Culcer

The study of the non-linear anomalous Hall effect (NLAHE) in $\mathcal{P}\mathcal{T}$-symmetric systems has focussed on intrinsic mechanisms. Here we show that disorder contributes substantially to NLAHE and often overwhelms intrinsic terms. We identify terms to zeroth order in the disorder strength involving the Berry curvature dipole, skew scattering and side-jump, all exhibiting a strong peak as a function of the Fermi energy, a signature of interband coherence. Our results suggest NLAHE at experimentally relevant transport densities in $\mathcal{P}\mathcal{T}$-symmetric systems is likely to be extrinsic.


Edge theory of the non-Hermitian skin modes in higher dimensions. (arXiv:2309.03950v1 [cond-mat.mes-hall])
Kai Zhang, Zhesen Yang, Kai Sun

In this Letter, we propose a universal edge theory for the higher-dimensional non-Hermitian edge-skin modes. In contrast to the well-understood corner-skin effect, we demonstrate that the edge-skin effect requires the protection of reciprocity or inversion. Through an exact mapping, we show that these skin modes share the same bulk-edge correspondence as the Fermi-arc states in a Hermitian Dirac semimetal. Based on this mapping, we introduce a bulk projection criterion to identify the skin edge, and utilize the non-Bloch Hamiltonian under specific cylinder geometry to characterize the localization features of edge-skin modes. We find that the edge-skin modes are made of components with real-valued momenta along the edge, and interestingly the decay direction typically deviates from the normal direction of the edge, a phenomenon we term skewness. Furthermore, we reveal the remarkable sensitivity of the cylinder-geometry spectrum to disturbances that violate fragile reciprocity. When this symmetry is disrupted, the cylinder-geometry spectrum undergoes an abrupt transition towards the near open-boundary spectrum, underscoring a key difference between corner-skin and edge-skin effects.


3D Topological Semimetal Phases of Strained $\alpha$-Sn on Insulating Substrate. (arXiv:2309.03951v1 [cond-mat.mtrl-sci])
Jakub Polaczyński, Gauthier Krizman, Alexandr Kazakov, Bartłomiej Turowski, Joaquin Bermejo Ortiz, Rafał Rudniewski, Tomasz Wojciechowski, Piotr Dłużewski, Marta Aleszkiewicz, Wojciech Zaleszczyk, Bogusława Kurowska, Zahir Muhammad, Marcin Rosmus, Natalia Olszowska, Louis-Anne De Vaulchier, Yves Guldner, Tomasz Wojtowicz, Valentine V. Volobuev

$\alpha$-Sn is an elemental topological material, whose topological phases can be tuned by strain and magnetic field. Such tunability offers a substantial potential for topological electronics. However, InSb substrates, commonly used to stabilize $\alpha$-Sn allotrope, suffer from parallel conduction, restricting transport investigations and potential applications. Here, the successful MBE growth of high-quality $\alpha$-Sn layers on insulating, hybrid CdTe/GaAs(001) substrates, with bulk electron mobility approaching 20000 cm$^2$V$^{-1}$s$^{-1}$ is reported. The electronic properties of the samples are systematically investigated by independent complementary techniques, enabling thorough characterization of the 3D Dirac (DSM) and Weyl (WSM) semimetal phases induced by the strains and magnetic field, respectively. Magneto-optical experiments, corroborated with band structure modeling, provide an exhaustive description of the bulk states in the DSM phase. The modeled electronic structure is directly observed in angle-resolved photoemission spectroscopy, which reveals linearly dispersing bands near the Fermi level. The first detailed study of negative longitudinal magnetoresistance relates this effect to the chiral anomaly and, consequently, to the presence of WSM. Observation of the $\pi$ Berry phase in Shubnikov-de Haas oscillations agrees with the topologically non-trivial nature of the investigated samples. Our findings establish $\alpha$-Sn as an attractive topological material for exploring relativistic physics and future applications.


A contactless scanning near-field optical dilatometer imaging the thermal expansivity of inhomogeneous 2D materials and thin films at the nanoscale. (arXiv:2309.04017v1 [physics.app-ph])
Victor Wong, Sabastine Ezugwu, Giovanni Fanchini

To date, there are very few experimental techniques, if any, that are suitable for the purpose of acquiring, with nanoscale lateral resolution, quantitative maps of the thermal expansivity of 2D materials and thin films, despite huge demand for nanoscale thermal management, for example in designing integrated circuitry for power electronics. Besides, contactless analytical tools for determining the thermal expansion coefficient (TEC) are highly desirable, because probes in contact with the sample significantly perturb any thermal measurements. Here, we introduce {\omega}-2{\omega} near-field thermoreflectance imaging, as an all-optical and contactless approach to map the TEC at the nanoscale with precision. Testing of our technique is performed on nanogranular films of gold and multilayer graphene (ML-G) platelets. Our method demonstrates that the TEC of Au is higher at the metal-insulator interface, with an average of (17.12 +/- 2.30)x10-6 K-1 in agreement with macroscopic techniques. For ML-G, the average TEC was (-5.77 +/- 3.79)x10-6 K-1 and is assigned to in-plane vibrational bending modes. A vibrational-thermal transition from graphene to graphite is observed, where the TEC becomes positive as the ML thickness increases. Our nanoscale method demonstrates results in excellent agreement with its macroscopic counterparts, as well as superior capabilities to probe 2D materials and interfaces.


Ab initio calculations of low-energy quasiparticle lifetimes in bilayer graphene. (arXiv:2309.04048v1 [cond-mat.mes-hall])
Catalin D. Spataru, François Léonard

Motivated by recent experimental results we calculate from first-principles the lifetime of low-energy quasiparticles in bilayer graphene (BLG). We take into account the scattering rate arising from electron-electron interactions within the $GW$ approximation for the electron self-energy and consider several p-type doping levels ranging from $0$ to $\rho \approx 2.4\times 10^{12}$ holes/cm$^2$. In the undoped case we find that the average inverse lifetime scales linearly with energy away from the charge neutrality point, with values in good agreement with experiments. The decay rate is approximately three times larger than in monolayer graphene, a consequence of the enhanced screening in BLG. In the doped case, the dependence of the inverse lifetime on quasiparticle energy acquires a non-linear component due to the opening of an additional decay channel mediated by acoustic plasmons.


Microwave spectroscopy of Majorana vortex modes. (arXiv:2309.04050v1 [cond-mat.supr-con])
Zhibo Ren, Justin Copenhaver, Leonid Rokhinson, Jukka I. Väyrynen

The observation of zero-bias conductance peaks in vortex cores of certain Fe-based superconductors has sparked renewed interest in vortex-bound Majorana states. These materials are believed to be intrinsically topological in their bulk phase, thus avoiding potentially problematic interface physics encountered in superconductor-semiconductor heterostructures. However, progress toward a vortex-based topological qubit is hindered by our inability to measure the topological quantum state of a non-local vortex Majorana state, i.e., the charge of a vortex pair. In this paper, we theoretically propose a microwave-based charge parity readout of the Majorana vortex pair charge. A microwave resonator above the vortices can couple to the charge allowing for a dispersive readout of the Majorana parity. Our technique may also be used in vortices in conventional superconductors and allows one to probe the lifetime of vortex-bound quasiparticles, which is currently beyond existing scanning tunneling microscopy capabilities.


Observation of Hybrid-Order Topological Pump in a Kekule-Textured Graphene Lattice. (arXiv:2309.04051v1 [cond-mat.mes-hall])
Tianzhi Xia, Yuzeng Li, Qicheng Zhang, Xiying Fan, Meng Xiao, Chunyin Qiu

Thouless charge pumping protocol provides an effective route for realizing topological particle transport. To date, the first-order and higher-order topological pumps, exhibiting transitions of edge-bulk-edge and corner-bulk-corner states, respectively, are observed in a variety of experimental platforms. Here, we propose a concept of hybrid-order topological pump, which involves a transition of bulk, edge, and corner states simultaneously. More specifically, we consider a Kekul\'e-textured graphene lattice that features a tunable phase parameter. The finite sample of zigzag boundaries, where the corner configuration is abnormal and inaccessible by repeating unit cells, hosts topological responses at both the edges and corners. The former is protected by a nonzero winding number, while the latter can be explained by a nontrivial vector Chern number. Using our skillful acoustic experiments, we verify those nontrivial boundary landmarks and visualize the consequent hybrid-order topological pump process directly. This work deepens our understanding to higher-order topological phases and broadens the scope of topological pumps.


Chiral magneto-phonons with tunable topology in anisotropic quantum magnets. (arXiv:2309.04064v1 [cond-mat.mes-hall])
Bowen Ma, Z. D. Wang, Gang Chen

We propose a mechanism to obtain chiral phonon-like excitations from the bond-dependent magnetoelastic couplings in the absence of out-of-plane magnetization and magnetic fields. We provide a systematic way to understand the hybrid excitation by its phononic analog, and thus we dub it magneto-phonon. We recognize that the system is equivalent to the class D of topological phonons, and show the tunable chirality and topology by an in-plane magnetic field in the example of a triangular lattice ferromagnet. As a possible experimental probe, we evaluate the thermal Hall conductivity. Our study gives a new perspective on tunable topological and chiral excitations without Dzaloshinskii-Moriya and Raman spin interactions, which suggests possible applications of spintronics and phononics in various anisotropic magnets and/or Kitaev materials.


Driven Majorana Modes: A Route to Synthetic $p_x+ip_y$ Superconductivity. (arXiv:2309.04155v1 [cond-mat.supr-con])
Lingyu Yang, Gia-Wei Chern, Shi-Zeng Lin

We propose a protocol to realize synthetic $p_x+ip_y$ superconductors in one-dimensional topological systems that host Majorana fermions. By periodically driving a localized Majorana mode across the system, our protocol realizes a topological pumping of Majorana fermions, analogous to the adiabatic Thouless pumping of electrical charges. Importantly, similar to the realization of a Chern insulator through Thouless pumping, we show that pumping of Majorana zero modes could lead to a $p_x + ip_y$ superconductor in the two dimensions of space and synthetic time. The Floquet theory is employed to map the driven one-dimensional system to a two-dimensional synthetic system by considering frequency as a new dimension. We demonstrate such Floquet $p_x + i p_y$ superconductors using the Kitaev $p$-wave superconductor chain, a prototypical 1D topological system, as well as its more realistic realization in the 1D Kondo lattice model as examples. We further show the appearance of a new $\pi$ Majorana mode at the Floquet zone boundary in an intermediate drive frequency region. Our work suggests a driven magnetic spiral coupled to a superconductor as a promising platform for the realization of novel topological superconductors.


Metastable Charge Distribution Between Degenerate Landau Levels. (arXiv:2309.04166v1 [cond-mat.mes-hall])
Wenlu Lin, Xing Fan, Lili Zhao, Yoon Jang Chung, Adbhut Gupta, Kirk W. Baldwin, Loren Pfeiffer, Hong Lu, Yang Liu

We study two dimensional electron systems confined in wide quantum wells whose subband separation is comparable with the Zeeman energy. Two N = 0 Landau levels from different subbands and with opposite spins are pinned in energy when they cross each other and electrons can freely transfer between them. When the disorder is strong, we observe clear hysteresis in our data corresponding to instability of the electron distribution in the two crossing levels. When the intra-layer interaction dominates, multiple minima appear when a Landau level is 1/3 or 2/3 filled and fractional quantum hall effect can be stabilized.


Comment on "Extending the Laws of Thermodynamics for Arbitrary Autonomous Quantum Systems". (arXiv:2309.04170v1 [quant-ph])
Philipp Strasberg

Recently, Elouard and Lombard Latune [PRX Quantum 4, 020309 (2023)] claimed to extend the laws of thermodynamics to "arbitrary quantum systems" valid "at any scale" using "consistent" definitions allowing them to "recover known results" from the literature. I show that their definitions are in conflict with textbook thermodynamics and over- or underestimate the real entropy production by orders of magnitude. The cause of this problem is traced back to problematic definitions of entropy and temperature, the latter, for instance, violates the zeroth law. It is pointed out that another framework presented in PRX Quantum 2, 030202 (2021) does not suffer from these problems, while Elouard and Lombard Latune falsely claim that it only provides a positive entropy production for a smaller class of initial states. A simple way to unify both approaches is also presented.


Two-dimensional Discommensurations: an extension to McMillan's Ginzburg-Landau Theory. (arXiv:2309.04201v1 [cond-mat.str-el])
Lotte Mertens, Jeroen van den Brink, Jasper van Wezel

Charge density waves (CDW) profoundly affect the electronic properties of materials and have an intricate interplay with other collective states, like superconductivity and magnetism. The well-known macroscopic Ginzburg-Landau theory stands out as a theoretical method for describing CDW phenomenology without requiring a microscopic description. In particular, it has been instrumental in understanding the emergence of domain structures in several CDW compounds, as well as the influence of critical fluctuations and the evolution towards or across lock-in transitions. In this context, McMillan's foundational work introduced discommensurations as the objects mediating the transition from commensurate to incommensurate CDW, through an intermediate nearly commensurate phase characterised by an ordered array of phase slips. Here, we extend the simplified, effectively one-dimensional, setting of the original model to a fully two-dimensional analysis. We find exact and numerical solutions for several types of discommensuration patterns and provide a framework for consistently describing multi-component CDW embedded in quasi-two-dimensional atomic lattices.


Symmetry-Enriched Criticality in a Coupled Spin-Ladder. (arXiv:2309.04205v1 [cond-mat.str-el])
Suman Mondal, Adhip Agarwala, Tapan Mishra, Abhishodh Prakash

We study a one-dimensional ladder of two coupled XXZ spin chains and identify several distinct gapless symmetry-enriched critical phases. These have the same unbroken symmetries and long-wavelength description, but cannot be connected without encountering either a phase transition or other intermediate phases. Using bosonizaion, we analyze the nature of their distinction by determining how microscopic symmetries are manifested in the long-wavelength fields, the behavior of charged local and nonlocal operators, and identify the universality class of all direct continuous phase transitions between them. One of these phases is a gapless topological phase with protected edge modes. We characterize its precise nature and place it within the broader classification. We also find the occurrence of `multiversality' in the phase diagram, wherein two fixed phases are separated by continuous transitions with different universality classes in different parameter regimes. We determine the phase diagram and all its aspects, as well as verify our predictions numerically using density matrix renormalization group and a mapping onto an effective spin-1 model.


Interband scattering- and nematicity-induced quantum oscillation frequency in FeSe. (arXiv:2309.04237v1 [cond-mat.str-el])
Valentin Leeb, Johannes Knolle

Understanding the nematic phase observed in the iron-chalcogenide materials is crucial for describing their superconducting pairing. Experiments on FeSe$_{1-x}$S$_x$ showed that one of the slow Shubnikov--de Haas quantum oscillation frequencies disappears when tuning the material out of the nematic phase via chemical substitution or pressure, which has been interpreted as a Lifshitz transition [Coldea et al., npj Quant Mater 4, 2 (2019), Reiss et al., Nat. Phys. 16, 89-94 (2020)]. Here, we present a generic, alternative scenario for a nematicity-induced sharp quantum oscillation frequency which disappears in the tetragonal phase and is not connected to an underlying Fermi surface pocket. We show that different microscopic interband scattering mechanisms - for example, orbital-selective scattering - in conjunction with nematic order can give rise to this quantum oscillation frequency beyond the standard Onsager relation. We discuss implications for iron-chalcogenides and the interpretation of quantum oscillations in other correlated materials.


Programmable Real-Time Magnon Interference in Two Remotely Coupled Magnonic Resonators. (arXiv:2309.04289v1 [cond-mat.mes-hall])
Moojune Song, Tomas Polakovic, Jinho Lim, Thomas W. Cecil, John Pearson, Ralu Divan, Wai-Kwong Kwok, Ulrich Welp, Axel Hoffmann, Kab-Jin Kim, Valentine Novosad, Yi Li

Magnon interference is a signature of coherent magnon interactions for coherent information processing. In this work, we demonstrate programmable real-time magnon interference, with examples of nearly perfect constructive and destructive interference, between two remotely coupled yttrium iron garnet spheres mediated by a coplanar superconducting resonator. Exciting one of the coupled resonators by injecting single- and double-microwave pulse leads to the coherent energy exchange between the remote magnonic resonators and allows us to realize a programmable magnon interference that can define an arbitrary state of coupled magnon oscillation. The demonstration of time-domain coherent control of remotely coupled magnon dynamics offers new avenues for advancing coherent information processing with circuit-integrated hybrid magnonic networks.


Universal diffusion of dendrimers in a semidilute solution of linear polymers. (arXiv:2309.04290v1 [cond-mat.soft])
Silpa Mariya, Jeremy J. Barr, P. Sunthar, J. Ravi Prakash

The static and dynamic properties of dendrimers in semidilute solutions of linear chains of comparable size are investigated using Brownian dynamics simulations. The radius of gyration and diffusivity of a wide variety of low generation dendrimers and linear chains in solution follow universal scaling laws independent of their topology. Analysis of the shape functions and internal density of dendrimers shows that they are more spherical than linear chains and have a dense core. At intermediate times, dendrimers become subdiffusive, with an exponent higher than that previously reported for nanoparticles in semidilute polymer solutions. The long-time diffusivity of dendrimers does not follow theoretical predictions for nanoparticles. We propose a new scaling law for the long-time diffusion coefficient of dendrimers which accounts for the fact that, unlike nanoparticles, dendrimers shrink with an increase in background solution concentration. Analysis of the properties of a special case of a higher functionality dendrimer shows a transition from polymer-like to nanoparticle-like behaviour.


Spin transport properties in a topological insulator sandwiched between two-dimensional magnetic layers. (arXiv:2309.04301v1 [cond-mat.mes-hall])
Nezhat Pournaghavi, Banasree Sadhukhan, Anna Delin

Nontrivial band topology along with magnetism leads to different novel quantum phases. When time-reversal-symmetry is broken in three-dimensional topological insulators (TIs) by applying high enough magnetic field or proximity effect, different phases such as quantum Hall or quantum anomalous Hall(QAH) emerge and display interesting transport properties for spintronic applications. The QAH phase displays sidewall chiral edge states which leads to the QAH effect. In a finite slab, contribution of the surface states depends on both the cross-section and thickness of the system. Having a small cross-section and a thin thickness leads to direct coupling of the surfaces, on the other hand, a thicker slab results in a higher contribution of the non-trivial sidewall states which connect top and bottom surfaces. In this regard, we have considered a heterostructure consisting of a TI, namely Bi2Se3, which is sandwiched between two-dimensional magnetic monolayers of CrI3 to study its topological and transport properties. Combining DFT and tight-binding calculations along with non-equilibrium Green's function formalism, we show that a well-defined exchange gap appears in the band structure in which spin polarised edge states flow. We also study the width and finite-size effect on the transmission and topological properties of this magnetised TI nanoribbon.


Cascade of multi-electron bubble phases in monolayer graphene at high Landau level filling. (arXiv:2309.04319v1 [cond-mat.mes-hall])
Fangyuan Yang, Ruiheng Bai, Alexander A. Zibrov, Sandeep Joy, Takashi Taniguchi, Kenji Watanabe, Brian Skinner, Mark O. Goerbig, Andrea F. Young

The phase diagram of an interacting two-dimensional electron system in a high magnetic field is enriched by the varying form of the effective Coulomb interaction, which depends strongly on the Landau level index. While the fractional quantum Hall states that dominate in the lower energy Landau levels have been explored experimentally in a variety of two-dimensional systems, much less work has been done to explore electron solids owing to their subtle transport signatures and extreme sensitivity to disorder. Here we use chemical potential measurements to map the phase diagram of electron solid states in $N=2$, $N=3$, and $N=4$ Landau levels in monolayer graphene. Direct comparison between our data and theoretical calculations reveals a cascade of density-tuned phase transitions between electron bubble phases up to two, three or four electrons per bubble in the N=2, 3 and 4 Landau levels respectively. Finite temperature measurements are consistent with melting of the solids for T$\approx$1K.


Understanding the role of Hubbard corrections in the rhombohedral phase of BaTiO$_3$. (arXiv:2309.04348v1 [cond-mat.mtrl-sci])
G. Gebreyesus, Lorenzo Bastonero, Michele Kotiuga, Nicola Marzari, Iurii Timrov

We present a first-principles study of the low-temperature rhombohedral phase of BaTiO$_3$ using Hubbard-corrected density-functional theory. By employing density-functional perturbation theory, we compute the onsite Hubbard $U$ for Ti($3d$) states and the intersite Hubbard $V$ between Ti($3d$) and O($2p$) states. We show that applying the onsite Hubbard $U$ correction alone to Ti($3d$) states proves detrimental, as it suppresses the Ti($3d$)-O($2p$) hybridization and drives the system towards a cubic phase. Conversely, when both onsite $U$ and intersite $V$ are considered, the localized character of the Ti($3d$) states is maintained, while also preserving the Ti($3d$)-O($2p$) hybridization, restoring the rhombohedral phase of BaTiO$_3$. The generalized PBEsol+$U$+$V$ functional yields remarkable agreement with experimental results for the band gap and dielectric constant, while the optimized geometry is slightly less accurate compared to PBEsol. Zone-center phonon frequencies and Raman spectra, being significantly influenced by the underlying geometry, demonstrate better agreement with experiments in the case of PBEsol, while PBEsol+$U$+$V$ exhibits reduced accuracy, and the PBEsol+$U$ Raman spectrum diverges remarkably from experimental data, highlighting the adverse impact of the $U$ correction alone in BaTiO$_3$. Our findings underscore the promise of the extended Hubbard PBEsol+$U$+$V$ functional with first-principles $U$ and $V$ for the investigation of other ferroelectric perovskites with mixed ionic-covalent interactions.


Strong relevance of Zinc impurity in the spin-$\frac{1}{2}$ Kagome quantum antiferromagnets: a variational study. (arXiv:2309.04363v1 [cond-mat.str-el])
Jianhua Yang, Tao Li

Copper hydroxyhalide materials herbertsmithite ZnCu$_{3}$(OH)$_{6}$Cl$_{2}$ and Zn-barlowite ZnCu$_{3}$(OH)$_{6}$FrBr are thought to be the best realizations of the spin-$\frac{1}{2}$ Kagome quantum antiferromagnetic Heisenberg model and are widely believed to host a spin liquid ground state. However, the exact nature of such a novel state of matter is still under strong debate, partly due to the complication related to the occupation disorder between the Zinc and the Copper ions in these systems. In particular, recent nuclear magnetic resonance measurements indicate that the magnetic response of the Kagome plane is significantly spatial inhomogeneous, even though the content of the misplaced Zinc or Copper ions is believed to be very small. Here we use extensive variational optimization to show that the well known $U(1)$-Dirac spin liquid state is extremely sensitive to the introduction of the nonmagnetic Zinc impurity in the Kagome plane. More specifically, we find that the Zinc impurities can significantly reorganize the local spin correlation pattern around them and induce strong spatial oscillation in the magnetic response of the system. We argue that this is a general trend in highly frustrated quantum magnet systems, in which the nonmagnetic impurity may act as strongly relevant perturbation on the emergent resonating valence bond structure in their spin liquid ground state. We also argue that the strong spatial oscillation in the magnetic response should be attributed to the free moment released by the doped Zinc ions and may serve as the smoking gun evidence for the Dirac node in the $U(1)$ Dirac spin liquid state on the Kagome lattice.


Single-molecule time-resolved spectroscopy in a tunable STM nanocavity. (arXiv:2309.04416v1 [cond-mat.mes-hall])
Jiří Doležal, Amandeep Sagwal, Rodrigo Cezar de Campos Ferreira, Martin Švec

The spontaneous fluorescence rates of single-molecule emitters are typically on the order of nanoseconds. However coupling them with plasmonic nanostructures can substantially increase their fluorescence yields. The confinement between the tip and sample of a scanning tunneling microscope creates a tunable nanocavity, an ideal platform for exploring the yields and excitation decay rates of single-molecule emitters depending on the coupling strength to the nanocavity. With this setup we estimate the excitation lifetimes from the direct time-resolved measurements of the fluorescence decays of phthalocyanine adsorbates, decoupled from the metal substrates by ultrathin NaCl layers. It is found that nanosecond-range lifetimes prevail for the emitters away from the nanocavity, whereas for the tip approached to a molecule, we find a substantial effect of the nanocavity coupling, which reduces the lifetimes to a few picoseconds. An analysis is performed to investigate the crossover between the far-field and tip-enhanced photoluminescence regimes. This approach overcomes the drawbacks associated with the estimation of lifetimes for single molecules from their respective emission linewidths.


Sequences of dislocation reactions and helicity transformations in tubular crystals. (arXiv:2309.04417v1 [cond-mat.soft])
Andrei Zakharov, Daniel A. Beller

Freestanding tubular crystals offer a general description of crystalline order on deformable surfaces with cylindrical topology, such as single-walled carbon nanotubes, microtubules, and recently reported colloidal assemblies. These systems exhibit a rich interplay between the crystal's helicity on its periodic surface, the deformable geometry of that surface, and the motions of topological defects within the crystal. Previously, in simulations of tubular crystals as elastic networks, we found that dislocations in nontrivial patterns can co-stabilize with kinks in the tube shape, producing mechanical multistability. Here, we extend that work with detailed Langevin dynamics simulations, in order to explore defect dynamics efficiently and without the constraints imposed by elastic network models. Along with the predicted multistability of dislocation glide, we find a variety of irreversible defect transformations, including vacancy formation, particle extrusions, and "reactions" that reorient dislocation pairs. Moreover, we report spontaneous sequences of several such defect transformations, which are unique to tubular crystals. We demonstrate a simple method for controlling these sequences through a time-varying external force.


Quantum work statistics of controlled evolutions. (arXiv:2309.04419v1 [quant-ph])
Steve Campbell

We use the quantum work statistics to characterize the controlled dynamics governed by a counterdiabatic driving field. Focusing on the Shannon entropy of the work probability distribution, $P(W)$, we demonstrate that the thermodynamics of a controlled evolution serves as an insightful tool for studying the non-equilibrium dynamics of complex quantum systems. In particular, we show that the entropy of $P(W)$ recovers the expected scaling according to the Kibble-Zurek mechanism for the Landau-Zener model. Furthermore, we propose that the entropy of the work distribution provides a useful summary statistic for characterizing the need and complexity of the control fields for many-body systems.


Antiskyrmionic ferroelectric medium. (arXiv:2303.07389v2 [cond-mat.mtrl-sci] UPDATED)
Mauro A. P. Gonçalves, Marek Paściak, Jiří Hlinka

Typical magnetic skyrmion is a string of inverted magnetization within a ferromagnet, protected by a sleeve of a vortex-like spin texture, such that its cross-section carries a positive integer topological charge. Some magnets form antiskyrmions, the antiparticle strings which carry a negative topological charge instead. Here we demonstrate that topologically equivalent but purely electric antiskyrmion can exist in a ferroelectric material as well. In particular, our computer experiments reveal that the archetype ferroelectric, barium titanate, can host antiskyrmions. The polarization pattern around their cores reminds ring windings of decorative knots rather than the typical magnetic antiskyrmion texture. We show that the antiskyrmion of barium titanate has just 2-3 nm in diameter, a hexagonal cross-section, and an exotic topological charge of minus two. We deduce that formation of antiskyrmions is favored by a fortunate combination of the moderate anisotropy of the anharmonic electric susceptibility and the characteristic anisotropy of the polarization correlations in barium titanate crystals.


Flat bands and multi-state memory devices from chiral domain wall superlattices in magnetic Weyl semimetals. (arXiv:2303.16918v2 [cond-mat.mes-hall] UPDATED)
Vivian Rogers, Swati Chaudhary, Richard Nguyen, Jean Anne Incorvia

We propose a novel analog memory device utilizing the gigantic magnetic Weyl semimetal (MWSM) domain wall (DW) magnetoresistance. We predict that the nucleation of domain walls between contacts will strongly modulate the conductance and allow for multiple memory states, which has been long sought-after for use in magnetic random access memories or memristive neuromorphic computing platforms. We motivate this conductance modulation by analyzing the electronic structure of the helically-magnetized MWSM Hamiltonian, and report tunable flat bands in the direction of transport in a helically-magnetized region of the sample for Bloch and Neel-type domain walls via the onset of a local axial Landau level spectrum within the bulk of the superlattice. We show that Bloch devices also provide means for the generation of chirality-polarized currents, which provides a path towards nanoelectronic utilization of chirality as a new degree of freedom in spintronics.


Defining a quantum active particle using a non-unitary quantum walk. (arXiv:2305.15319v2 [quant-ph] UPDATED)
Manami Yamagishi, Naomichi Hatano, Hideaki Obuse

The main aim of the present paper is to define an active matter in a quantum framework and investigate difference and commonalities of quantum and classical active matters. Although the research field of active matter has been expanding wider, most research is conducted in classical systems. We here propose a truly deterministic quantum active-matter model with a non-unitary quantum walk as minimal models of quantum active matter. We aim to reproduce similar results that Schweitzer et al. (1998) obtained with their classical active Brownian particle; the Brownian particle, with a finite energy take-up, becomes active and climbs up a potential wall. We realize such a system with non-unitary quantum walks. We introduce new internal states, the ground and excited states, and a new non-unitary operator for an asymmetric transition between the two states. The non-Hermiticity parameter $g$ promotes transition to the excited state and hence the particle takes up energy from the environment. We realize a system without momentum conservation by manipulating a parameter $\theta$ for the coin operator for a quantum walk; we utilize the property that the continuum limit of a one-dimensional discrete-time quantum walk gives the Dirac equation with its mass proportional to the parameter $\theta$ (Strauch, 2006). With our quantum active particle, we successfully observe that the movement of the quantum walker becomes more active in a non-trivial way as we increase the non-Hermiticity parameter $g$, which is similar to the classical active Brownian particle (Schweitzer et al., 1998). Meanwhile, we also observe three unique features of quantum walks, namely, ballistic propagation of peaks in one dimension, the walker staying on the constant energy plane in two dimensions, and oscillations originating from the resonant transition between the ground state and excited state both in one and two dimensions.


Electrical conductivity of crack-template-based transparent conductive films: A computational point of view. (arXiv:2307.01509v2 [cond-mat.dis-nn] UPDATED)
Yuri Yu. Tarasevich, Andrei V. Eserkepov, Irina V. Vodolazskaya

Crack-template-based transparent conductive films (TCFs) are promising kinds of junction-free, metallic network electrodes that can be used, e.g., for transparent electromagnetic interference (EMI) shielding. Using image processing of published photos of TCFs, we have analyzed the topological and geometrical properties of such crack templates. Additionally, we analyzed the topological and geometrical properties of some computer-generated networks. We computed the electrical conductance of such networks against the number density of their cracks. Comparison of these computations with predictions of the two analytical approaches revealed the proportionality of the electrical conductance to the square root of the number density of the cracks was found, this being consistent with the theoretical predictions.


Superionic phase transition of copper(I) sulfide and its implication for purported superconductivity of LK-99. (arXiv:2308.05222v3 [cond-mat.supr-con] UPDATED)
Prashant K. Jain

Lee, Kim, and coworkers have recently claimed room-temperature and ambient-pressure superconductivity in a copper-doped lead apatite material named LK-99. However, the polycrystalline material synthesized has a significant fraction of copper(I) sulfide. Copper(I) sulfide has a known phase transition at 104 degrees C from an ordered low-temperature phase to a high-temperature superionic phase. As a result of this phase transition, copper(I) sulfide exhibits sharp transitions in electrical resistivity and heat capacity, which are expected to coincide with the temperature-induced transitions reported for LK-99. This implies that LK-99 must be synthesized without any copper(I) sulfide to allow unambiguous validation of the superconducting properties of LK-99.


A study of dissipative models based on Dirac matrices. (arXiv:2308.05245v2 [quant-ph] UPDATED)
Jyotsna Gidugu, Daniel P. Arovas

We generalize the recent work of Shibata and Katsura, who considered a S=1/2 chain with alternating XX and YY couplings in the presence of dephasing, the dynamics of which are described by the GKLS master equation. Their model is equivalent to a non-Hermitian system described by the Kitaev formulation in terms of a single Majorana species hopping on a two-leg ladder in the presence of a nondynamical Z_2 gauge field. Our generalization involves Dirac gamma matrix `spin' operators on the square lattice, and maps onto a non-Hermitian square lattice bilayer which is also Kitaev-solvable. We describe the exponentially many non-equilibrium steady states in this model. We identify how the spin degrees of freedom can be accounted for in the 2d model in terms of the gauge-invariant quantities and then proceed to study the Liouvillian spectrum. We use a genetic algorithm to estimate the Liouvillian gap and the first decay modes for large system sizes. We observe a transition in the first decay modes, similar to that found by Shibata and Katsura. The results we obtain are consistent with a perturbative analysis for small and large values of the dissipation strength.


Observation of integer and fractional quantum anomalous Hall effects in twisted bilayer MoTe2. (arXiv:2308.06177v3 [cond-mat.mes-hall] UPDATED)
Fan Xu, Zheng Sun, Tongtong Jia, Chang Liu, Cheng Xu, Chushan Li, Yu Gu, Kenji Watanabe, Takashi Taniguchi, Bingbing Tong, Jinfeng Jia, Zhiwen Shi, Shengwei Jiang, Yang Zhang, Xiaoxue Liu, Tingxin Li

The interplay between strong correlations and topology can lead to the emergence of intriguing quantum states of matter. One well-known example is the fractional quantum Hall effect, where exotic electron fluids with fractionally charged excitations form in partially filled Landau levels. The emergence of topological moir\'e flat bands provides exciting opportunities to realize the lattice analogs of both the integer and fractional quantum Hall states without the need for an external magnetic field. These states are known as the integer and fractional quantum anomalous Hall (IQAH and FQAH) states. Here, we present direct transport evidence of the existence of both IQAH and FQAH states in twisted bilayer MoTe2 (AA stacked). At zero magnetic field, we observe well-quantized Hall resistance of h/e2 around moir\'e filling factor {\nu} = -1 (corresponding to one hole per moir\'e unit cell), and nearly-quantized Hall resistance of 3h/2e2 around {\nu} = -2/3, respectively. Concomitantly, the longitudinal resistance exhibits distinct minima around {\nu} = -1 and -2/3. The application of an electric field induces topological quantum phase transition from the IQAH state to a charge transfer insulator at {\nu} = -1, and from the FQAH state to a generalized Wigner crystal state, further transitioning to a metallic state at {\nu} = -2/3. Our study paves the way for the investigation of fractionally charged excitations and anyonic statistics at zero magnetic field based on semiconductor moir\'e materials.


Disorder Operator and R\'enyi Entanglement Entropy of Symmetric Mass Generation. (arXiv:2308.07380v3 [cond-mat.str-el] UPDATED)
Zi Hong Liu, Yuan Da Liao, Gaopei Pan, Menghan Song, Jiarui Zhao, Weilun Jiang, Chao-Ming Jian, Yi-Zhuang You, Fakher F. Assaad, Zi Yang Meng, Cenke Xu

In recent years a consensus has gradually been reached that the previously proposed deconfined quantum critical point (DQCP) for spin-1/2 systems, an archetypal example of quantum phase transition beyond the classic Landau's paradigm, actually does not correspond to a true unitary conformal field theory (CFT). In this work we carefully investigate another type of quantum phase transition supposedly beyond the similar classic paradigm, the so called ``symmetric mass generation" (SMG) transition proposed in recent years. We employ the sharp diagnosis including the scaling of disorder operator and R\'enyi entanglement entropy in large-scale lattice model quantum Monte Carlo simulations. Our results strongly suggest that the SMG transition is indeed an unconventional quantum phase transition and it should correspond to a true $(2+1)d$ unitary CFT.


Observation of Flat Band and Van Hove Singularity in Non-superconducting Nitrogen-doped Lutetium Hydride. (arXiv:2308.16420v2 [cond-mat.supr-con] UPDATED)
Xin Liang, Zihan Lin, Jun Zhang, Jianfa Zhao, Shiyu Feng, Wenlong Lu, Guodong Wang, Luchuan Shi, Ningning Wang, Pengfei Shan, Zao Zhang, Muntaser Naamneh, Runzhe Liu, Bastien Michon, Jinguang Cheng, Changqing Jin, Yang Ren, Junzhang Ma

Hydrogen-rich materials offer a compelling avenue towards room temperature superconductivity, albeit under ultra-high pressure. However, the experimental investigation of the electronic band structure remains elusive, due to the inherent instability of most of the hydrogen-rich materials upon pressure release. Very recently, nitrogen-doped lutetium hydride was claimed to host room temperature superconductivity under near ambient pressure but was disproven by following works. Upon decompression, nitrogen doped lutetium hydride manifests a stable metallic phase with dark blue color. Moreover, high temperature superconductivity has been reported in lutetium hydrides Lu4H23 (~71 K) under around 200 GPa. These properties engender an unprecedented opportunity, allowing for the experimental investigation of the electronic band structure intrinsic to hydrogen-rich material. In this work, using angle resolved photoemission spectroscopy to investigate the non-superconducting nitrogen doped lutetium hydride, we observed significant flat band and Van Hove singularity marginally below the Fermi level. These salient features, identified as critical elements, proffer potential amplifiers for the realization of heightened superconductivity, as evidenced by prior research. Our results not only unveil a confluence of potent strong correlation effects and anisotropy within the Lu-H-N compound, but also provide a prospect for engineering high temperature superconductivity through the strategic manipulation of flat band and the VHS, effectively tailoring their alignment with the Fermi energy.


Unveiling the electronic properties of BiP$_3$ triphosphide from bulk to graphene-based heterostructure by first-principles calculations. (arXiv:2309.02216v2 [cond-mat.mtrl-sci] UPDATED)
Dominike P. de Andrade Deus, Igor S. S. de Oliveira, Roberto Hiroki Miwa, Erika N. Lima

Triphosphides, with a chemical formula of XP$_3$ (X is a group IIIA, IVA, or VA element), have recently attracted much attention due to their great potential in several applications. Here, using density functional theory calculations, we describe for the first time the structural and electronic properties of the bulk bismuth triphosphide (BiP$_3$). Phonon spectra and molecular dynamics simulations confirm that the 3D crystal of BiP$_3$ is a metal thermodynamically stable with no bandgap. Unlike the bulk, the mono-, bi-, tri-, and tetra-layers of BiP$_3$ are semiconductors with a bandgap ranging from 1.4 to 0.06 eV. However, stackings with more than five layers exhibit metallic behavior equal to the bulk. The results show that quantum confinement is a powerful tool for tuning the electronic properties of BiP$_3$ triphosphide, making it suitable for technological applications. Building on this, the electronic properties of van der Waals heterostructure constructed by graphene (G) and the BiP$_3$ monolayer (m-BiP$_3$) were investigated. Our results show that the Dirac cone in graphene remains intact in this heterostructure. At the equilibrium interlayer distance, the G/m-BiP$_3$ forms an n-type contact with a Schottky barrier height of 0.5 eV. It is worth noting that the SHB in the G/m-BiP$_3$ heterostructure can be adjusted by changing the interlayer distance or applying a transverse electric field. Thus, we show that few-layers BiP$_3$ is an interesting material for realizing nanoelectronic and optoelectronic devices and is an excellent option for designing Schottky nanoelectronic devices.


Nonrelativistic Dirac fermions on the torus. (arXiv:2309.03302v1 [hep-th] CROSS LISTED)
Jeremías Aguilera-Damia, Mario Solís, Gonzalo Torroba

Two dimensional conformal feld theories have been extensively studied in the past. When considered on the torus, they are strongly constrained by modular invariance. However, introducing relevant deformations or chemical potentials pushes these theories away from criticality, where many of their aspects are still poorly understood. In this note we make a step towards filling this gap, by analyzing the theory of a Dirac fermion on the torus, deformed by a mass term and a chemical potential for the particle number symmetry. The theory breaks conformal and Lorentz invariance, and we study its spectrum and partition function. We also focus on two limits that are interesting on their own right: a massless relativistic fermion with nonzero chemical potential (a simple model for CFTs at finite density), and nonrelativistic Schrodinger fermions (of relevance in condensed matter systems). Taking inspiration from recent developments in massive modular forms, we obtain a representation of the torus free energy based on Fourier-transforming over a twisted boundary condition. This dual representation fullfills many properties analogous to modular invariance in CFTs. In particular, we use this result to derive Cardy-like formulas for the high energy density of states of these theories.


Found 18 papers in nano-lett
Date of feed: Sun, 10 Sep 2023 13:16:15 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

[ASAP] Determining the Number of Graphene Nanoribbons in Dual-Gate Field-Effect Transistors
Jian Zhang, Gabriela Borin Barin, Roman Furrer, Cheng-Zhuo Du, Xiao-Ye Wang, Klaus Müllen, Pascal Ruffieux, Roman Fasel, Michel Calame, and Mickael L. Perrin

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Nano Letters
DOI: 10.1021/acs.nanolett.3c01931

[ASAP] Ultrafast Electronic Dynamics in Anisotropic Indirect Interlayer Excitonic States of Monolayer WSe2/ReS2 Heterojunctions
Yulu Qin, Rui Wang, Xiaoyuan Wu, Yunkun Wang, Xiaofang Li, Yunan Gao, Liangyou Peng, Qihuang Gong, and Yunquan Liu

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02488

[ASAP] Toward High-Peak-to-Valley-Ratio Graphene Resonant Tunneling Diodes
Zihao Zhang, Baoqing Zhang, Yiming Wang, Mingyang Wang, Yifei Zhang, Hu Li, Jiawei Zhang, and Aimin Song

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02281

[ASAP] Kinetics of Nanobubbles in Tiny-Angle Twisted Bilayer Graphene
Chao Yan, Ya-Xin Zhao, Yi-Wen Liu, and Lin He

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02286

[ASAP] One-Step Passivation of Both Sulfur Vacancies and SiO2 Interface Traps of MoS2 Device
Byungwook Ahn, Yoonsok Kim, Meeree Kim, Hyang Mi Yu, Jaehun Ahn, Eunji Sim, Hyunjin Ji, Hamza Zad Gul, Keun Soo Kim, Kyuwook Ihm, Hyoyoung Lee, Eun Kyu Kim, and Seong Chu Lim

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Nano Letters
DOI: 10.1021/acs.nanolett.3c01753

[ASAP] Spatial Precision Tailoring the Catalytic Activity of Graphene Monolayers for Designing Janus Swimmers
Ruchao Gao, S. Mohsen Beladi-Mousavi, Gerardo Salinas, Patrick Garrigue, Lin Zhang, and Alexander Kuhn

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02314

[ASAP] Pseudospin Polarized Dual-Higher-Order Topology in Hydrogen-Substituted Graphdiyne
Tingfeng Zhang, Tianyi Hu, Yongqi Zhang, and Zhengfei Wang

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02684

[ASAP] Direct Visualization of the Charge Transfer in a Graphene/α-RuCl3 Heterostructure via Angle-Resolved Photoemission Spectroscopy
Antonio Rossi, Cameron Johnson, Jesse Balgley, John C. Thomas, Luca Francaviglia, Riccardo Dettori, Andreas K. Schmid, Kenji Watanabe, Takashi Taniguchi, Matthew Cothrine, David G. Mandrus, Chris Jozwiak, Aaron Bostwick, Erik A. Henriksen, Alexander Weber-Bargioni, and Eli Rotenberg

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Nano Letters
DOI: 10.1021/acs.nanolett.3c01974

[ASAP] Observation of Termination-Dependent Topological Connectivity in a Magnetic Weyl Kagome Lattice
Federico Mazzola, Stefan Enzner, Philipp Eck, Chiara Bigi, Matteo Jugovac, Iulia Cojocariu, Vitaliy Feyer, Zhixue Shu, Gian Marco Pierantozzi, Alessandro De Vita, Pietro Carrara, Jun Fujii, Phil D. C. King, Giovanni Vinai, Pasquale Orgiani, Cephise Cacho, Matthew D. Watson, Giorgio Rossi, Ivana Vobornik, Tai Kong, Domenico Di Sante, Giorgio Sangiovanni, and Giancarlo Panaccione

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02022

[ASAP] Robust Luttinger Liquid State of 1D Dirac Fermions in a Van der Waals System Nb9Si4Te18
Qirong Yao, Hyunjin Jung, Kijeong Kong, Chandan De, Jaeyoung Kim, Jonathan D. Denlinger, and Han Woong Yeom

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Nano Letters
DOI: 10.1021/acs.nanolett.3c01789

[ASAP] Ultraflat Graphene Oxide Membranes with Newton-Ring Prepared by Vortex Shear Field for Ion Sieving
Tianqi Liu, Xin Zhang, Jing Liang, Wenbin Liang, Wei Qi, Longlong Tian, Lijuan Qian, Zhan Li, and Ximeng Chen

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02613

[ASAP] Photoinduced Nonvolatile Resistive Switching Behavior in Oxygen-Doped MoS2 for a Neuromorphic Vision System
Ke Chang, Xinhui Zhao, Xinna Yu, Zhikai Gan, Renzhi Wang, Anhua Dong, Zhuyikang Zhao, Yafei Zhang, and Hui Wang

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02499

[ASAP] Coherent Phonons in van der Waals MoSe2/WSe2 Heterobilayers
Changxiu Li, Alexey V. Scherbakov, Pedro Soubelet, Anton K. Samusev, Claudia Ruppert, Nilanthy Balakrishnan, Vitalyi E. Gusev, Andreas V. Stier, Jonathan J. Finley, Manfred Bayer, and Andrey V. Akimov

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02316

[ASAP] Uncooled Mid-Infrared Sensing Enabled by Chip-Integrated Low-Temperature-Grown 2D PdTe2 Dirac Semimetal
Longhui Zeng, Wei Han, Xiaoyan Ren, Xue Li, Di Wu, Shujuan Liu, Hao Wang, Shu Ping Lau, Yuen Hong Tsang, Chong-Xin Shan, and Jiansheng Jie

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02396

[ASAP] Switching the Moiré Lattice Models in the Twisted Bilayer WSe2 by Strain or Pressure
Yifan Gao, Qiaoling Xu, M. Umar Farooq, Lede Xian, and Li Huang

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Nano Letters
DOI: 10.1021/acs.nanolett.3c01756

[ASAP] Trapping Hydrogen Molecules between Perfect Graphene
Jie Xu, Weilin Liu, Wenna Tang, Gan Liu, Yujian Zhu, Guowen Yuan, Lei Wang, Xiaoxiang Xi, and Libo Gao

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02321

[ASAP] Elastocaloric Effect in Graphene Kirigami
Luiz A. Ribeiro Junior, Marcelo L. Pereira Junior, and Alexandre F. Fonseca

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02260

[ASAP] Spatially Coherent Tip-Enhanced Raman Spectroscopy Measurements of Electron–Phonon Interaction in a Graphene Device
Rafael Battistella Nadas, Andreij C. Gadelha, Tiago C. Barbosa, Cassiano Rabelo, Thiago de Lourenço e Vasconcelos, Vitor Monken, Ary V. R. Portes, Kenji Watanabe, Takashi Taniguchi, Jhonattan C. Ramirez, Leonardo C. Campos, Riichiro Saito, Luiz Gustavo Cançado, and Ado Jorio

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Nano Letters
DOI: 10.1021/acs.nanolett.3c00851

Found 19 papers in acs-nano
Date of feed: Sun, 10 Sep 2023 13:13:48 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

[ASAP] Direct Observation of Locally Modified Excitonic Effects within a Moiré Unit Cell in Twisted Bilayer Graphene
Ming Liu, Ryosuke Senga, Masanori Koshino, Yung-Chang Lin, and Kazu Suenaga

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ACS Nano
DOI: 10.1021/acsnano.3c06021

[ASAP] Chirality-Induced Spin Selectivity in Supramolecular Chirally Functionalized Graphene
Seyedamin Firouzeh, Sara Illescas-Lopez, Md Anik Hossain, Juan Manuel Cuerva, Luis Álvarez de Cienfuegos, and Sandipan Pramanik

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ACS Nano
DOI: 10.1021/acsnano.3c06903

[ASAP] On-Surface Synthesis of Graphene Nanoribbons with Atomically Precise Structural Heterogeneities and On-Site Characterizations
Ruoting Yin, Zhengya Wang, Shijing Tan, Chuanxu Ma, and Bing Wang

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ACS Nano
DOI: 10.1021/acsnano.3c06128

[ASAP] Chemical Amplification-Enabled Topological Modification of Nucleic Acid Aptamers for Enhanced Cancer-Targeted Theranostics
Hong Chen, Yazhou Li, Zhenzhen Xiao, Jili Li, Ting Li, Zhiqiang Wang, Yanlan Liu, and Weihong Tan

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ACS Nano
DOI: 10.1021/acsnano.3c01955

[ASAP] Bulk Photovoltaic Effect in Two-Dimensional Distorted MoTe2
Sikandar Aftab, Muhammad Arslan Shehzad, Hafiz Muhammad Salman Ajmal, Fahmid Kabir, Muhammad Zahir Iqbal, and Abdullah A. Al-Kahtani

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ACS Nano
DOI: 10.1021/acsnano.3c03593

[ASAP] Promoted Electronic Coupling of Acoustic Phonon Modes in Doped Semimetallic MoTe2
Xiangyue Cui, Hejin Yan, Xuefei Yan, Kun Zhou, and Yongqing Cai

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ACS Nano
DOI: 10.1021/acsnano.3c01229

[ASAP] Toward Edge Engineering of Two-Dimensional Layered Transition-Metal Dichalcogenides by Chemical Vapor Deposition
Wei Fu, Mark John, Thathsara D. Maddumapatabandi, Fabio Bussolotti, Yong Sean Yau, Ming Lin, and Kuan Eng Johnson Goh

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ACS Nano
DOI: 10.1021/acsnano.3c04581

[ASAP] Influence of the Magnetic Tip on Heterodimers in Electron Spin Resonance Combined with Scanning Tunneling Microscopy
Xue Zhang, Jose Reina-Gálvez, Christoph Wolf, Yu Wang, Hervé Aubin, Andreas J. Heinrich, and Taeyoung Choi

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ACS Nano
DOI: 10.1021/acsnano.3c04024

[ASAP] Multimodal E-Textile Enabled by One-Step Maskless Patterning of Femtosecond-Laser-Induced Graphene on Nonwoven, Knit, and Woven Textiles
Dongwook Yang, Han Ku Nam, Truong-Son Dinh Le, Jinwook Yeo, Younggeun Lee, Young-Ryeul Kim, Seung-Woo Kim, Hak-Jong Choi, Hyung Cheoul Shim, Seunghwa Ryu, Soongeun Kwon, and Young-Jin Kim

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ACS Nano
DOI: 10.1021/acsnano.3c04120

[ASAP] Nonlinear Optical Responses of Janus MoSSe/MoS2 Heterobilayers Optimized by Stacking Order and Strain
Nguyen Tuan Hung, Kunyan Zhang, Vuong Van Thanh, Yunfan Guo, Alexander A. Puretzky, David B. Geohegan, Jing Kong, Shengxi Huang, and Riichiro Saito

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ACS Nano
DOI: 10.1021/acsnano.3c04436

[ASAP] Direct Synthesis of Elastic and Stretchable Hierarchical Structured Fiber and Graphene-Based Sponges for Noise Reduction
Dingding Zong, Wenya Bai, Meng Geng, Xia Yin, Fei Wang, Jianyong Yu, Shichao Zhang, and Bin Ding

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ACS Nano
DOI: 10.1021/acsnano.3c06921

[ASAP] Controlled Formation of Fused Metal Chalcogenide Nanoclusters Using Soft Landing of Gaseous Fragment Ions
Habib Gholipour-Ranjbar, Hugo Y. Samayoa-Oviedo, and Julia Laskin

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ACS Nano
DOI: 10.1021/acsnano.3c05545

[ASAP] Two-Step Flux Synthesis of Ultrapure Transition-Metal Dichalcogenides
Song Liu, Yang Liu, Luke Holtzman, Baichang Li, Madisen Holbrook, Jordan Pack, Takashi Taniguchi, Kenji Watanabe, Cory R. Dean, Abhay N. Pasupathy, Katayun Barmak, Daniel A. Rhodes, and James Hone

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ACS Nano
DOI: 10.1021/acsnano.3c02511

[ASAP] Electroluminescence from Megasonically Solution-Processed MoS2 Nanosheet Films
Sonal V. Rangnekar, Vinod K. Sangwan, Mengru Jin, Maryam Khalaj, Beata M. Szydłowska, Anushka Dasgupta, Lidia Kuo, Heather E. Kurtz, Tobin J. Marks, and Mark C. Hersam

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ACS Nano
DOI: 10.1021/acsnano.3c06034

[ASAP] Electrochemical Li+ Insertion/Extraction Reactions at LiPON/Epitaxial Graphene Interfaces
Satoshi Yamamoto, Munekazu Motoyama, Masahiko Suzuki, Ryotaro Sakakibara, Norikazu Ishigaki, Akichika Kumatani, Wataru Norimatsu, and Yasutoshi Iriyama

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ACS Nano
DOI: 10.1021/acsnano.3c00158

[ASAP] Sub-5 nm Contacts and Induced p–n Junction Formation in Individual Atomically Precise Graphene Nanoribbons
Pin-Chiao Huang, Hongye Sun, Mamun Sarker, Christopher M. Caroff, Gregory S. Girolami, Alexander Sinitskii, and Joseph W. Lyding

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ACS Nano
DOI: 10.1021/acsnano.3c02794

[ASAP] Ultrafast Electronic Relaxation Dynamics of Atomically Thin MoS2 Is Accelerated by Wrinkling
Ce Xu, Guoqing Zhou, Evgeny M. Alexeev, Alisson R. Cadore, Ioannis Paradisanos, Anna K. Ott, Giancarlo Soavi, Sefaattin Tongay, Giulio Cerullo, Andrea C. Ferrari, Oleg V. Prezhdo, and Zhi-Heng Loh

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ACS Nano
DOI: 10.1021/acsnano.3c02917

[ASAP] Edge Contacts to Atomically Precise Graphene Nanoribbons
Wenhao Huang, Oliver Braun, David I. Indolese, Gabriela Borin Barin, Guido Gandus, Michael Stiefel, Antonis Olziersky, Klaus Müllen, Mathieu Luisier, Daniele Passerone, Pascal Ruffieux, Christian Schönenberger, Kenji Watanabe, Takashi Taniguchi, Roman Fasel, Jian Zhang, Michel Calame, and Mickael L. Perrin

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ACS Nano
DOI: 10.1021/acsnano.3c00782

[ASAP] Ultra-Wideband Mid-Infrared Chalcogenide Suspended Nanorib Waveguide Gas Sensors with Exceptionally High External Confinement Factor beyond Free-Space
Mingquan Pi, Chuantao Zheng, Huan Zhao, Zihang Peng, Gangyun Guan, Jialin Ji, Yijun Huang, Yuting Min, Lei Liang, Fang Song, Xue Bai, Yu Zhang, Yiding Wang, and Frank K. Tittel

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ACS Nano
DOI: 10.1021/acsnano.3c02699

Found 1 papers in scipost


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Exact multi-instantons in topological string theory, by Jie Gu, Marcos Mariño
< author missing >
Submitted on 2023-09-11, refereeing deadline 2023-10-17.