Found 30 papers in cond-mat


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Note:Bridging Information Science: AB Initio Calculation Vortex of 2D Materials of Bismuthene(Bismuth Molecule) Graphene-Shaped through Kohn-Sham Equations
Yasuko Kawahata
arXiv:2404.01312v1 Announce Type: new Abstract: This study delves into the intricate electronic and optical behaviors of two-dimensional (2D) honeycomb materials, such as Stannen, arsenene, antimonene, silicene, and bismuthene(bismuth molecule), through the lens of first-principles calculations(AB Initio Calculations) based on the Kohn-Sham equations. Focusing on the exchange-correlation potential approximations within the Density Functional Theory (DFT) framework, we evaluate the potential of these materials in digital information control and management. Special attention is given to the nonlinear optical responses and electronic properties under the influence of twisted bilayer configurations, external fields, and varying twist angles. The findings offer novel insights into the design of advanced digital devices, suggesting a transformative approach to information technology through the utilization of 2D honeycomb materials.

Cluster state as a non-invertible symmetry protected topological phase
Sahand Seifnashri, Shu-Heng Shao
arXiv:2404.01369v1 Announce Type: new Abstract: We show that the standard 1+1d $\mathbb{Z}_2\times \mathbb{Z}_2$ cluster model has a non-invertible global symmetry, described by the fusion category Rep(D$_8$). Therefore, the cluster state is not only a $\mathbb{Z}_2\times \mathbb{Z}_2$ symmetry protected topological (SPT) phase, but also a non-invertible SPT phase. We further find two new commuting Pauli Hamiltonians for the other two Rep(D$_8$) SPT phases on a tensor product Hilbert space of qubits, matching the classification in field theory and mathematics. We identify the edge modes and the local projective algebras at the interfaces between these non-invertible SPT phases. Finally, we show that there does not exist a symmetric entangler that maps between these distinct SPT states.

A new theoretical approach to disordered Majorana nanowires: Studying disorder without any disorder
Haining Pan, Sankar Das Sarma
arXiv:2404.01379v1 Announce Type: new Abstract: The interplay of disorder and short finite wire length is the crucial physics hindering progress in the semiconductor-superconductor nanowire platform for realizing non-Abelian Majorana zero modes (MZM). Disorder effectively segments the nanowire into isolated patches of quantum dots (QD) which act as subgap Andreev bound states often mimicking MZMs. In this work, we propose and develop a new theoretical approach to model disorder, effectively a spatially varying effective mass model, which does not rely on incorporating unknown microscopic details of disorder into the Hamiltonian. This model effectively segments the wire into multiple QDs, characterized by highly enhanced effective mass at impurity sites leading to the segmentation of the wire into effective random QDs. We find that this model can reproduce disorder physics, providing a crystal clear way to understand the effects of disorder by comparing the mean free path to the superconducting coherence length. In addition, this model allows precise control over the disorder regime, enabling us to evaluate the reliability of topological invariants (TI) in predicting MZMs. We find that TIs alone may yield a significant false positive rate as indicators for topology in the actual wire with increasing disorder strength. Therefore, we propose new indicators to characterize the spatial distribution of the zero-energy state, emphasizing the key necessity for isolated MZMs localized at wire ends. Employing this set of new indicators for stringent characterizations, we explore their experimental relevance to the measured differential conductance spectra. Our findings highlight the critical role of isolated localized states, beyond the TI, in identifying topological MZMs. We believe that this approach is a powerful tool for studying realistic Majorana nanowires where disorder and short wire length obfuscate the underlying topological physics.

Wehnelt Photoemission in an Ultrafast Electron Microscope: Stability and Usability
Simon A. Willis, Wyatt A. Curtis, David J. Flannigan
arXiv:2404.01434v1 Announce Type: new Abstract: We tested and compared the stability and usability of three different cathode materials and configurations in a thermionic-based ultrafast electron microscope: (1) on-axis thermionic and photoemission from a 0.1-mm diameter LaB6 source with graphite guard ring, (2) off-axis photoemission from the Ni aperture surface of the Wehnelt electrode, and (3) on-axis thermionic and photoemission from a 0.2-mm diameter polycrystalline Ta source. For each cathode type and configuration, we illustrate how the photoelectron beam-current stability is deleteriously impacted by simultaneous cooling of the source following thermionic heating. Further, we demonstrate usability via collection of parallel- and convergent-beam electron diffraction patterns and by formation of optimum probe size. We find that usability of the off-axis Ni Wehnelt-aperture photoemission is at least comparable to on-axis LaB6 thermionic emission, as well as to on-axis photoemission. However, the stability and achievable beam currents for off-axis photoemission from the Wehnelt aperture were superior to that of the other cathode types and configurations, regardless of the electron-emission mechanism. Beam-current stability for this configuration was found to be within 1% of the mean for 70 minutes (longest duration tested), and steady-state beam current was reached within the sampling-time resolution used here (~1 s) for 15 pA beam currents (i.e., 460 electrons per packet for a 200 kHz repetition rate). Repeatability and robustness of the steady-state condition was also found to be within 1% of the mean. We discuss the implications of these findings for UEM imaging and diffraction experiments, for pulsed-beam damage measurements, and for practical switching between optimum conventional TEM and UEM operation within the same instrument.

Approach and rotation of reconnecting topological defect lines in liquid crystal
Yohei Zushi, Cody D. Schimming, Kazumasa A. Takeuchi
arXiv:2404.01480v1 Announce Type: new Abstract: Topological defects are a universal concept across many disciplines, such as crystallography, liquid-crystalline physics, low-temperature physics, cosmology, and even biology. In nematic liquid crystals, topological defects called disclinations have been widely studied. For their three-dimensional (3D) dynamics, however, only recently have theoretical approaches dealing with fully 3D configurations been reported. Further, recent experiments have observed 3D disclination line reconnections, a phenomenon characteristic of defect line dynamics, but detailed discussions were limited to the case of approximately parallel defects. In this study, we focus on the case of two disclination lines that approach at finite angles and lie in separate planes, a more fundamentally 3D reconnection configuration. Observation and analysis showed the square-root law of the distance between disclinations and the decrease of the inter-disclination angle over time. We compare the experimental results with theory and find qualitative agreement on the scaling of distance and angle with time, but quantitative disagreement on distance and angle relative mobilities. To probe this disagreement, we derive the equations of motion for systems with reduced twist constant and also carry out simulations for this case. These, together with the experimental results, suggest that deformations of disclinations may be responsible for the disagreement.

C-type antiferromagnetic structure of topological semimetal CaMnSb$_2$
Bo Li, Xu-Tao Zeng, Qianhui Xu, Fan Yang, Junsen Xiang, Hengyang Zhong, Sihao Deng, Lunhua He, Juping Xu, Wen Yin, Xingye Lu, Huiying Liu, Xian-Lei Sheng, Wentao Jin
arXiv:2404.01600v1 Announce Type: new Abstract: Determination of the magnetic structure and confirmation of the presence or absence of inversion ($\mathcal{P}$) and time reversal ($\mathcal{T}$) symmetry is imperative for correctly understanding the topological magnetic materials. Here high-quality single crystals of the layered manganese pnictide CaMnSb$_2$ are synthesized using the self-flux method. De Haas-van Alphen oscillations indicate a nontrivial Berry phase of $\sim$ $\pi$ and a notably small cyclotron effective mass, supporting the Dirac semimetal nature of CaMnSb$_2$. Neutron diffraction measurements identify a C-type antiferromagnetic (AFM) structure below $T\rm_{N}$ = 303(1) K with the Mn moments aligned along the $a$ axis, which is well supported by the density functional theory (DFT) calculations. The corresponding magnetic space group is $Pn'm'a'$, preserving a $\mathcal{P}\times\mathcal{T}$ symmetry. Adopting the experimentally determined magnetic structure, band crossings near the Y point in momentum space and linear dispersions of the Sb $5p_{y,z}$ bands are revealed by the DFT calculations. Furthermore, our study predicts the possible existence of an intrinsic second-order nonlinear Hall effect in CaMnSb$_2$, offering a promising platform to study the impact of topological properties on nonlinear electrical transports in antiferromagnets.

Understanding spin currents from magnon dispersion and polarization: Spin-Seebeck effect and neutron scattering study on Tb3Fe5O12
Y. Kawamoto, T. Kikkawa, M. Kawamata, Y. Umemoto, A. G. Manning, K. C. Rule, K. Ikeuchi, K. Kamazawa, M. Fujita, E. Saitoh, K. Kakurai, Y. Nambu
arXiv:2404.01603v1 Announce Type: new Abstract: Magnon spin currents in the ferrimagnetic garnet Tb3Fe5O12 with 4f electrons were examined through the spin-Seebeck effect and neutron scattering measurements. The compound shows a magnetic compensation, where the spin-Seebeck signal reverses above and below Tcomp = 249.5(4) K. Unpolarized neutron scattering unveils two major magnon branches with finite energy gaps, which are well-explained in the framework of spin-wave theory. Their temperature dependencies and the direction of the precession motion of magnetic moments, i.e. magnon polarization, defined using polarized neutrons, explain the reversal at Tcomp and decay of the spin-Seebeck signals at low temperatures. We illustrate an example that momentum- and energy-resolved microscopic information is a prerequisite to understanding the magnon spin current.

Predicting room-temperature conductivity of Na-ion super ionic conductors with the minimal number of easily-accessible descriptors
Seong-Hoon Jang, Randy Jalem, Yoshitaka Tateyama
arXiv:2404.01627v1 Announce Type: new Abstract: Given the vast compositional possibilities Na$_nM_mM_{m'}$Si$_{3-p-a}$P$_p$As$_a$O$_{12}$, Na-ion superionic conductors (NASICON) are attractive but complicate for designing materials with enhanced room-temperature Na-ion conductivity $\sigma_{\rm Na,300K}$. We propose an explicit regression model for $\sigma_{\rm Na,300K}$ with easily-accessible descriptors, by exploiting density functional theory molecular dynamics (DFT-MD). Initially, we demonstrate that two primary descriptors, the bottleneck width along Na-ion diffusion paths $d_1$ and the average Na-Na distance $\langle d_{\rm Na-Na} \rangle$, modulate room-temperature Na-ion self-diffusion coefficient $D_{\rm Na,300K}$. Then, we introduce two secondary easily-accessible descriptors: Na-ion content n, which influences $d_1$, $\langle d_{\rm Na-Na} \rangle$, and Na-ion density $\rho_{\rm Na}$; and the average ionic radius $\langle r_M \rangle$ of metal ions, which impacts $d_1$ and $\langle d_{\rm Na-Na} \rangle$. These secondary descriptors enable the development of a regression model for $\sigma_{\rm Na,300K}$ with $n$ and $\langle r_M \rangle$ only. Subsequently, this model identifies a promising yet unexplored stable composition, Na$_{2.75}$Zr$_{1.75}$Nb$_{0.25}$Si$_2$PO$_{12}$, which, upon DFT-MD calculations, indeed exhibits $\sigma_{\rm Na,300K} > 10^{^3}$ S$\cdot$cm$^{-1}$. Furthermore, the adjusted version effectively fits $140$ experimental values with $R^2=0.718$.

Equilibrium and Non-Equilibrium Molecular Dynamics Simulation of Thermo-Osmosis: Enhanced Effects on Polarized Graphene Surfaces
Mehdi Ouadfel (ILM), Samy Merabia (ILM), Yasutaka Yamaguchi (ILM), Laurent Joly (ILM)
arXiv:2404.01708v1 Announce Type: new Abstract: Thermo-osmotic flows, generated by applying a thermal gradient along a liquid-solid interface, could be harnessed to convert waste heat into electricity. While this phenomenon has been known for almost a century, there is a crucial need to gain a better understanding of the molecular origins of thermo-osmosis. In this paper, we start by detailing the multiple contributions to thermo-osmosis. We then showcase three approaches to compute the thermo-osmotic coefficient using molecular dynamics; a first method based on the computation of the interfacial enthalpy excess and Derjaguin's theoretical framework, a second approach based on the computation of the interfacial entropy excess using the so-called dry-surface method, and a novel non-equilibrium method to compute the thermo-osmotic coefficient in a periodic channel. We show that the three methods align with each other, in particular for smooth surfaces. In addition, for a polarized graphene-water interface, we observe large variations of thermo-osmotic responses, and multiple changes in flow direction with increasing surface charge. Overall, this study showcases the versatility of osmotic flows and calls for experimental investigation of thermo-osmotic behavior in the vicinity of charged surfaces.

Photodriven Mott insulating heterostructures: A steady-state study of impact ionization processes
Paolo Gazzaneo, Daniel Werner, Tommaso Maria Mazzocchi, Enrico Arrigoni
arXiv:2404.01729v1 Announce Type: new Abstract: We investigate the photocurrent and spectral features in a simplified model of a Mott photovoltaic system consisting of a multilayered insulating heterostructure. The central correlated region is coupled to two metallic leads kept at different chemical potentials. A periodic drive applied to the correlated region produces excited doublons and holons across the Mott gap which are then separated by a potential gradient, which mimics the polarization-induced electric field present in oxyde heterostructures. The nonequilibrium Floquet steady-state is addressed by means of dynamical mean-field theory and its Floquet extension, while the so-called auxiliary master equation approach is employed as impurity solver. We find that impact ionization, identified by a kink in the photocurrent as function of the driving frequency, becomes significant and is generally favoured by weak, narrow-band hybridizations to the leads beyond a certain strength of the driving field. On the other hand, in the case of a direct coupling to metallic leads with a flat band, we observe a drastic reduction of impact ionization and of the photocurrent itself.

Real-space Calculation of Orbital Hall Responses in Disordered Materials
Luis M. Canonico, Jose H. Garc\'ia, Stephan Roche
arXiv:2404.01739v1 Announce Type: new Abstract: We developed an efficient numerical approach to compute the different components of the orbital Hall responses in disordered materials from the Berry phase theory of magnetization. We propose a theoretical framework based on the Chebyshev expansion of Green's functions and the position operator for systems under arbitrary boundary conditions. The capability of this scheme is illustrated by computing the orbital Hall conductivity for gapped graphene and Haldane model in the presence of nonperturbative disorder effects. This methodology opens the door to realistic simulations of orbital Hall responses in arbitrary complex models of disordered materials.

Stacking of charge-density waves in 2H-NbSe$_2$ bilayers
Fabrizio Cossu, Dhani Nafday, Krisztian Palot\'as, Mehdi Biderang, Heung-Sik Kim, Alireza Akbari, Igor Di Marco
arXiv:2404.01807v1 Announce Type: new Abstract: We employ ab-initio electronic structure calculations to investigate the charge-density waves and periodic lattice distortions in bilayer 2H-NbSe$_2$. We demonstrate that the vertical stacking can give rise to a variety of patterns that may lower the symmetry of the CDW exhibited separately by the two composing 1H-NbSe$_2$ monolayers. The general tendency to a spontaneous symmetry breaking observed in the ground state and the first excited states is shown to originate from a non-negligible inter-layer coupling. Simulated images for scanning tunnelling microscopy (STM) as well as diffraction/scattering patterns show signatures of the different stacking orders. This may not only be useful to reinterpret past experiments on surfaces and thin films, but may also be exploited to devise ad-hoc experiments for the investigation of the stacking order in 2H-NbSe$_2$. We anticipate that our analysis does not only apply to the 2H-NbSe$_2$ bilayer, but is also relevant for thin films and bulk, whose smallest centro-symmetric component is indeed the bilayer. Finally, our results illustrate clearly that the vertical stacking is not only important for 1T structures, as exemplified by the metal-to-insulator transition observed in 1T-TaS$_2$, but seems to be a general feature of metallic layered transition metal dichalcogenides as well.

Superhard lon C5 and derived carbon nitrides: C4N and C2N2. Crystal chemistry and first principles DFT studies
Samir F Matar
arXiv:2404.01813v1 Announce Type: new Abstract: Super-hard C5 with lon topology (lon: Lonsdaleite hexagonal diamond) and characterized by the presence of sp3 and sp2 -like carbon sites is devised from crystal chemistry and used as template matrix structure for identifying original carbonitrides C4N and C2N2 with lon topology except for the equiatomic belonging to a new topology (3,4L147). The steric effect of N(2s2) lone pair is highlighted in C2N2 in inducing an original structure of largely separated two-layered stacking of tetrahedra. The investigations based on crystal chemistry were backed by computations within the quantum density functional theory DFT. All systems were found cohesive and both mechanically (elastic constants) and dynamically (phonons band structures) stable. Super hardness characterizes the carbon allotrope C5 and the nitrides C4N and C2N2. Metallic-like conductivities and insulating characters were identified.

Electrically tunable High-Chern-number quasiflat bands in twisted antiferromagnetic topological insulators
Huaiqiang Wang, Yiliang Fan, Haijun Zhang
arXiv:2404.01912v1 Announce Type: new Abstract: Isolated flat bands with significantly quenched kinetic energy of electrons could give rise to exotic strongly correlated states from electron-electron interactions. More intriguingly, the interplay between topology and flat bands can further lead to richer physical phenomena, which have attracted much interest. Here, taking advantage of the recently proposed intertwined Dirac states induced from the anisotropic coupling between top and bottom surface states of an antiferromagnetic topological insulator thin film, we show the emergence of a high-Chern-number (quasi)flat-band state through Moir\'e engineering of the surface states. Remarkably, the flat bands are isolated from other bands and located near the Fermi level. Furthermore, topological phase transitions between trivial and nontrivial flat-band states can be driven by tuning the out-of-plane electric field. Our work not only proposes a new scheme to realize high-Chern-number flat-band states, but also highlights the versatility of the intertwined Dirac-cone states.

Frustration-induced quantum criticality in Ni-doped CePdAl as revealed by the $\mu$SR technique
I. Ishant, T. Shiroka, O. Stockert, V. Fritsch, M. Majumder
arXiv:2404.01917v1 Announce Type: new Abstract: In CePdAl, the 4$f$ moments of cerium arrange to form a geometrically frustrated kagome lattice. Due to frustration in addition to Kondo- and RKKY- interactions, this metallic system shows a long-range magnetic order (LRO) with a $T_{\rm N}$ of only 2.7\,K. Upon Ni doping at the Pd sites, $T_{\rm N}$ is further suppressed, to reach zero at a critical concentration $x_c \approx 0.15$. Here, by using muon-spin relaxation and rotation ($\mu$SR), we investigate at a local level CePd$_{1-x}$Ni$_x$Al for five different Ni-concentrations, both above and below $x_c$. Similar to the parent CePdAl compound, for $x = 0.05$, we observe an incommensurate LRO, which turns into a quasi-static magnetic order for $x = 0.1$ and 0.14. More interestingly, away from $x_c$, for $x = 0.16$ and 0.18, we still observe a non-Fermi liquid regime, evidenced by a power-law divergence of the longitudinal relaxation at low temperatures. In this case, longitudinal field measurements exhibit a time-field scaling, indicative of a cooperative spin dynamics that persists for $x > x_c$. Furthermore, similar to the externally applied pressure, the chemical pressure induced by Ni doping suppresses the region below $T^*$, characterized by a spin-liquid like dynamical behavior. Our results suggest that the magnetic properties of CePdAl are similarly affected by the hydrostatic- and the chemical pressure. We also confirm that the unusual non-Fermi liquid regime (compared to conventional quantum critical systems) is due to the presence of frustration that persists up to the highest Ni concentrations.

The ground state of electron-doped $t-t'-J$ model on cylinders
Yang Shen, Xiangjian Qian, Mingpu Qin
arXiv:2404.01979v1 Announce Type: new Abstract: We perform a comprehensive study of the electron-doped $t-t'-J$ model on cylinders with Density Matrix Renormalization Group (DMRG). We adopt both periodic and anti-periodic boundary conditions along the circumference direction to explore the finite size effect. We study doping levels of $1/6$, $1/8$, and $1/12$ which represent the most interesting region in the phase diagram of electron-doped cuprates. We find that for width-4 and 6 systems, the ground state for fixed doping switches between anti-ferromagnetic Neel state and stripe state under different boundary conditions and with system widths, indicating the presence of large finite size effect in the $t-t'-J$ model. We also have a careful analysis of the $d$-wave pairing correlations which also changes quantitatively with boundary conditions and widths of the system. However, the pairing correlations are enhanced when the system becomes wider for all dopings, suggesting the existence of possible long-ranged superconducting order in the thermodynamic limit. The width-8 results are found to be dependent on the starting state in the DMRG calculation for the kept states we can reach. For width-8 system only Neel (stripe) state can be stabilized in DMRG calculation for $1/12$ ($1/6$) doping, while both stripe and Neel states are stable in the DMRG sweep for $1/8$ doping, regardless of the boundary conditions. These results indicate that $1/8$ doping is likely to lie in the boundary of a phase transition between the Neel phase with lower doping and the stripe phase with higher doping, consistent with the previous study. The sensitivity of ground state on boundary conditions and size observed in this work is similar to that in the $t'$- Hubbard model.

Superionic Fluoride Gate Dielectrics with Low Diffusion Barrier for Advanced Electronics
Kui Meng, Zeya Li, Peng Chen, Xingyue Ma, Junwei Huang, Jiayi Li, Feng Qin, Caiyu Qiu, Yilin Zhang, Ding Zhang, Yu Deng, Yurong Yang, Genda Gu, Harold Y. Hwang, Qi-Kun Xue, Yi Cui, Hongtao Yuan
arXiv:2404.02011v1 Announce Type: new Abstract: Exploration of new dielectrics with large capacitive coupling is an essential topic in modern electronics when conventional dielectrics suffer from the leakage issue near breakdown limit. To address this looming challenge, we demonstrate that rare-earth-metal fluorides with extremely-low ion migration barriers can generally exhibit an excellent capacitive coupling over 20 $\mu$F cm$^{-2}$ (with an equivalent oxide thickness of ~0.15 nm and a large effective dielectric constant near 30) and great compatibility with scalable device manufacturing processes. Such static dielectric capability of superionic fluorides is exemplified by MoS$_2$ transistors exhibiting high on/off current ratios over 10$^8$, ultralow subthreshold swing of 65 mV dec$^{-1}$, and ultralow leakage current density of ~10$^{-6}$ A cm$^{-2}$. Therefore, the fluoride-gated logic inverters can achieve significantly higher static voltage gain values, surpassing ~167, compared to conventional dielectric. Furthermore, the application of fluoride gating enables the demonstration of NAND, NOR, AND, and OR logic circuits with low static energy consumption. Notably, the superconductor-to-insulator transition at the clean-limit Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ can also be realized through fluoride gating. Our findings highlight fluoride dielectrics as a pioneering platform for advanced electronics applications and for tailoring emergent electronic states in condensed matters.

Infrared nanosensors of pico- to micro-newton forces
Natalie Fardian-Melamed, Artiom Skripka, Changhwan Lee, Benedikt Ursprung, Thomas P. Darlington, Ayelet Teitelboim, Xiao Qi, Maoji Wang, Jordan M. Gerton, Bruce E. Cohen, Emory M. Chan, P. James Schuck
arXiv:2404.02026v1 Announce Type: cross Abstract: Mechanical force is an essential feature for many physical and biological processes.1-12 Remote measurement of mechanical signals with high sensitivity and spatial resolution is needed for diverse applications, including robotics,13 biophysics,14-20 energy storage,21-24 and medicine.25-27 Nanoscale luminescent force sensors excel at measuring piconewton forces,28-32 while larger sensors have proven powerful in probing micronewton forces.33,34 However, large gaps remain in the force magnitudes that can be probed remotely from subsurface or interfacial sites, and no individual, non-invasive sensor is capable of measuring over the large dynamic range needed to understand many systems.35,36 Here, we demonstrate Tm3+-doped avalanching nanoparticle37 force sensors that can be addressed remotely by deeply penetrating near-infrared (NIR) light and can detect piconewton to micronewton forces with a dynamic range spanning more than four orders of magnitude. Using atomic force microscopy coupled with single-nanoparticle optical spectroscopy, we characterize the mechanical sensitivity of the photon avalanching process and reveal its exceptional force responsiveness. By manipulating the Tm3+ concentrations and energy transfer within the nanosensors, we demonstrate different optical force-sensing modalities, including mechanobrightening and mechanochromism. The adaptability of these nanoscale optical force sensors, along with their multiscale sensing capability, enable operation in the dynamic and versatile environments present in real-world, complex structures spanning biological organisms to nanoelectromechanical systems (NEMS).

Circularly Polarized Luminescence Without External Magnetic Fields from Individual CsPbBr3 Perovskite Quantum Dots
Virginia Oddi, Chenglian Zhu, Michael A. Becker, Yesim Sahin, Dmitry N. Dirin, Taehee Kim, Rainer F. Mahrt, Jacky Even, Gabriele Rain\`o, Maksym V. Kovalenko, Thilo St\"oferle
arXiv:2404.02130v1 Announce Type: cross Abstract: Lead halide perovskite quantum dots (QDs), the latest generation of colloidal QD family, exhibit outstanding optical properties which are now exploited as both classical and quantum light sources. Most of their rather exceptional properties are related to the peculiar exciton fine-structure of band-edge states which can support unique bright triplet excitons. The degeneracy of the bright triplet excitons is lifted with energetic splitting in the order of millielectronvolts, which can be resolved by the photoluminescence (PL) measurements of single QDs at cryogenic temperatures. Each bright exciton fine-structure-state (FSS) exhibits a dominantly linear polarization, in line with several theoretical models based on the sole crystal field, exchange interaction and shape anisotropy. Here, we show that in addition to a high degree of linear polarization, the individual exciton FSS can exhibit a non-negligible degree of circular polarization even without external magnetic fields by investigating the four Stokes parameters of the exciton fine-structure in individual CsPbBr3 QDs through Stokes polarimetric measurements. We observe a degree of circular polarization up to ~38%, which could not be detected by using the conventional polarimetric technique. In addition, we found a consistent transition from left- to right-hand circular polarization within the fine-structure triplet manifold, which was observed in magnetic field dependent experiments. Our optical investigation provides deeper insights into the nature of the exciton fine-structures and thereby drives the yet-incomplete understanding of the unique photophysical properties of this novel class of QDs, potentially opening new scenarios in chiral quantum optics.

Generation, manipulation and detection of snake state trajectories of a neutral atom in a ring-cavity
Poornima Shakya (IIT Delhi), Nishant Dogra (Cavendish Laboratory, Cambridge University), Sankalpa Ghosh (IIT Delhi)
arXiv:2002.11926v3 Announce Type: replace Abstract: We propose a set-up to create and detect the atomic counterpart of snake state trajectories which occur at the interface where the magnetic field reverses direction. Such a magnetic field is generated by coupling two counter-propagating modes of a ring cavity to a two-level atom. The spatial distribution and the strength of the induced magnetic field are controlled by the transverse mode profile of the cavity modes and the number of photons in the two modes, respectively. By analysing the atomic motion in such a magnetic field while including the cavity back-action, we find that the atom follows snake state trajectories which can be non-destructively detected and reconstructed from the phase and the intensity of the light field leaking from the cavity. We finally show that the system parameters can be tuned to modify the transport properties of the snake states and even amplify the effect of cavity feedback which can completely alter their topology.

Structural Trends and Itinerant Magnetism of the New Cage-structured Compound HfMn$_{2}$Zn$_{20}$
Nusrat Yasmin, Md Fahel Bin Noor, Tiglet Besara
arXiv:2306.01146v3 Announce Type: replace Abstract: A new cage-structured compound - HfMn$_{2}$Zn$_{20}$ - belonging to the AB$_{2}$C$_{20}$ (A, B = transition or rare earth metals, and C = Al, Zn, or Cd) family of structures has been synthesized via the self-flux method. The new compound crystallizes in the space group Fd-3m with lattice parameter a = 14.0543(2) \r{A} (Z = 8) and exhibits non-stoichiometry due to Mn/Zn mixing on the Mn-site and an underoccupied Hf-site. The structure refines to Hf$_{0.93}$Mn$_{1.63}$Zn$_{20.37}$ and follows lattice size trends when compared to other HfM$_{2}$Zn$_{20}$ (M = Fe, Co, and Ni) structures. The magnetic measurements show that this compound displays a modified Curie-Weiss behavior with a transition temperature around 22 K. The magnetization shows no saturation, a small magnetic moment, and near negligible hysteresis, all signs of the itinerant magnetism. The Rhodes-Wohlfarth ratio and the spin fluctuation parameters ratio both confirm the itinerant nature of the magnetism in HfMn$_{2}$Zn$_{20}$.

Band mixing in the quantum anomalous Hall regime of twisted semiconductor bilayers
Ahmed Abouelkomsan, Aidan P. Reddy, Liang Fu, Emil J. Bergholtz
arXiv:2309.16548v2 Announce Type: replace Abstract: Remarkable recent experiments have observed fractional quantum anomalous Hall (FQAH) effects at zero field and unusually high temperatures in twisted semiconductor bilayer $t$MoTe$_2$. Intriguing observations in these experiments such as the absence of integer Hall effects at twist angles where a fractional Hall effect is observed, do however remain unexplained. The experimental phase diagram as a function of twist angle remains to be established. By comprehensive numerical study, we show that band mixing has large qualitative and quantitative effects on the energetics of competing states and their energy gaps throughout the twist angle range $\theta\leq 4^\circ$. This lays the ground for the detailed realistic study of a rich variety of strongly correlated twisted semiconductor multilayers and an understanding of the phase diagram of these fascinating systems.

Complete zero-energy flat bands of surface states in fully gapped chiral noncentrosymmetric superconductors
Clara J. Lapp, Julia M. Link, Carsten Timm
arXiv:2310.14800v2 Announce Type: replace Abstract: Noncentrosymmetric superconductors can support flat bands of zero-energy surface states in part of their surface Brillouin zone. This requires that they obey time-reversal symmetry and have a sufficiently strong triplet-to-singlet-pairing ratio to exhibit nodal lines in the bulk. These bands are protected by a winding number that relies on chiral symmetry, which is realized as the product of time-reversal and particle-hole symmetry. We reveal a way to stabilize a flat band in the entire surface Brillouin zone, while the bulk dispersion is fully gapped. This idea could lead to a robust platform for quantum computation and represents an alternative route to strongly correlated flat bands in two dimensions, besides twisted bilayer graphene. The necessary ingredient is an additional spin-rotation symmetry that forces the direction of the spin-orbit-coupling vector not to depend on the momentum component normal to the surface. We define a winding number that leads to flat zero-energy surface bands due to bulk-boundary correspondence. We discuss under which conditions this winding number is nonzero in the entire surface Brillouin zone and verify the occurrence of zero-energy surface states by exact numerical diagonalization of the Bogoliubov-de Gennes Hamiltonian for a slab. In addition, we consider how a weak breaking of the additional symmetry affects the surface band, employing first-order perturbation theory and a quasiclassical approximation. We find that the surface states and the bulk gap persist for weak breaking of the additional symmetry but that the band does not remain perfectly flat. The broadening of the band strongly depends on the deviation of the spin-orbit-coupling vector from its unperturbed direction as well as on the spin-orbit-coupling strength and the triplet-pairing amplitude.

Electric Fields Near Undulating Dielectric Membranes
Nicholas Pogharian, Alexandre P. dos Santos, Ali Ehlen, Monica Olvera de la Cruz
arXiv:2311.00570v3 Announce Type: replace Abstract: Dielectric interfaces are crucial to the behavior of charged membranes, from graphene to synthetic and biological lipid bilayers. Understanding electrolyte behavior near these interfaces remains a challenge, especially in the case of rough dielectric surfaces. A lack of analytical solutions consigns this problem to numerical treatments. We report an analytic method for determining electrostatic potentials near curved dielectric membranes in a two-dimensional periodic 'slab' geometry using a periodic summation of Green's functions. This method is amenable to simulating arbitrary groups of charges near surfaces with two-dimensional deformations. We concentrate on one-dimensional undulations. We show that increasing membrane undulation increases the asymmetry of interfacial charge distributions due to preferential ionic repulsion from troughs. In the limit of thick membranes we recover results mimicking those for electrolytes near a single interface. Our work demonstrates that rough surfaces generate charge patterns in electrolytes of charged molecules or mixed-valence ions.

Janus microswimmers are poor hydrodynamic mixers
Maximilian Bailey, Dmitry Fedosov, Federico Paratore, Fabio Grillo, Gerhard Gompper, Lucio Isa
arXiv:2311.03022v2 Announce Type: replace Abstract: The generation of fluid flows by autophoretic microswimmers has been proposed as a mechanism to enhance mass transport and mixing at the micro- and nanoscale. Here, we experimentally investigate the ability of model 2-D "active baths" of photocatalytic silica-titania Janus microspheres to enhance the diffusivity of tracer particles at different microswimmer densities below the onset of collective behaviour. Inspired by the similarities between our experimental findings and previous results for biological microorganisms, we then model our Janus microswimmers using a general squirmer framework, specifically treating them as neutral squirmers. The numerical simulations faithfully capture our observations, offer an insight into the microscopic mechanism underpinning tracer transport, and allow us to expand the parameter space beyond our experimental system. We find strong evidence that near-field interactions dominate enhancements in tracer diffusivity in active Janus baths, leading to the identification of an operating window for enhanced tracer transport by chemical microswimmers based on scaling arguments. Based on this argumentation, we suggest that for many chemically active colloidal systems, hydrodynamics alone is likely to be insufficient to induce appreciable mixing of passive components with large diffusion coefficients.

Amplified entanglement witnessed in a quantum critical metal
Yuan Fang, Mounica Mahankali, Yiming Wang, Lei Chen, Haoyu Hu, Silke Paschen, Qimiao Si
arXiv:2402.18552v2 Announce Type: replace Abstract: Strong correlations in matter promote a landscape of ground states and associated quantum critical points. For metallic systems, there is increasing recognition that the quantum criticality goes beyond the standard Landau framework and, thus, novel means are needed to characterize the quantum critical fluid. Here we do so by studying the entanglement properties near a quantum critical point of a strongly correlated metal. We calculate the mutual information and quantum Fisher information of an Anderson/Kondo lattice model across its Kondo destruction quantum critical point. The quantum Fisher information of the spin degree of freedom peaks at the quantum critical point and indicates a strongly entangled ground state. Our results are supported by the quantum Fisher information extracted from inelastic neutron scattering measurements in quantum critical heavy fermion metals. Our work opens a new avenue to advance the understanding of metallic quantum criticality in a broad range of strongly correlated systems, and points to a new regime of quantum matter to witness amplified entanglement.

Vibrational properties differ between halide and chalcogenide perovskite semiconductors, and it matters for optoelectronic performance
K. Ye, M. Menahem, T. Salzillo, F. Knoop, B. Zhao, S. Niu, I. Sadeghi, O. Hellman, J. Ravichandran, R. Jaramillo, O. Yaffe
arXiv:2402.18957v2 Announce Type: replace Abstract: We report a comparative study of temperature-dependent photoluminescence and structural dynamics of two perovskite semiconductors, the chalcogenide BaZrS$_3$ (BZS) and the halide CsPbBr$_3$ (CPB). These materials have similar crystal structures and direct band gaps, but we find that they have quite distinct optoelectronic and vibrational properties. Both materials exhibit thermally-activated non-radiative recombination, but the non-radiative recombination rate in BZS is between two and four orders of magnitude faster than in CPB. Raman spectroscopy reveals that the effects of phonon anharmonicity are far more pronounced in CPB than in BZS. Further, although both materials feature a large dielectric response due to low-energy polar optical phonons, the phonons in CPB are substantially lower in energy than in BZS. Our results suggest that electron-phonon coupling in BZS is more effective at non-radiative recombination than in CPB, and that BZS may also have a substantially higher concentration of non-radiative recombination centers than CPB. The low defect concentration in CPB may be related to the ease of lattice reconfiguration, typified by anharmonic bonding. It remains to be seen to what extent these differences are inherent to the chalcogenide and halide perovskites and to what extent they can be affected by materials processing; comparing BZS single-crystals and thin films provides reason for optimism.

Effect of Uncorrelated On-site Scalar Potential and Mass Disorder on Transport of Two-Dimensional Dirac Fermions
Arman Duha, Mario Borunda
arXiv:2403.03914v2 Announce Type: replace Abstract: We investigate the transport properties of massive Dirac fermions subjected to uncorrelated scalar potential disorder, and mass disorder. Using a finite difference method, the conductance is calculated for a wide variety of combinations of these two disorder strengths. By calculating the scaling of conductivity with system size we find that, depending on the combination, the system can have an insulating, scale invariant, and metallic behavior. We identify the critical values of these disorder strengths where the phase transitions occur. We study both the zero and nonzero average mass cases to examine the effect of scalar potential disorder on band gap. Our results suggest a suppression of the band gap by the scalar potential disorder.

Quantum Monte Carlo study of thin parahydrogen films on graphite
Jie-Ru Hu, Massimo Boninsegni
arXiv:2403.12637v3 Announce Type: replace Abstract: The low-temperature properties of one and two layers of parahydrogen adsorbed on graphite are investigated theoretically through Quantum Monte Carlo simulations. We adopt a microscopic model that explicitly includes the corrugation of the substrate. We study the phase diagram of a monolayer up to second layer promotion, and the possible occurrence of superfluidity in the second layer. We obtain results down to a temperature as low as 8 mK. We find second-layer promotion to occur at a considerably greater coverage than obtained in previous calculations and estimated experimentally; moreover, we find no evidence of a possible finite superfluid response in the second layer, disproving recent theoretical predictions.

Easy-to-configure zero-dimensional valley-chiral modes in a graphene point junction
Konstantin Davydov, Xi Zhang, Wei Ren, Matthew Coles, Logan Kline, Bryan Zucker, Kenji Watanabe, Takashi Taniguchi, Ke Wang
arXiv:2404.01027v2 Announce Type: replace Abstract: The valley degree of freedom in 2D materials can be manipulated for low-dissipation quantum electronics called valleytronics. At the boundary between two regions of bilayer graphene with different atomic or electrostatic configuration, valley-polarized current has been realized. However, the demanding fabrication and operation requirements limit device reproducibility and scalability toward more advanced valleytronics circuits. We demonstrate a new device architecture of a point junction where a valley-chiral 0D PN junction is easily configured, switchable, and capable of carrying valley current with an estimated polarization of ~80%. This work provides a new building block in manipulating valley quantum numbers and scalable valleytronics.

Found 9 papers in prb
Date of feed: Wed, 03 Apr 2024 03:17:02 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)

Modular extension of topological orders from congruence representations
Donghae Seo, Minyoung You, Gil Young Cho, and Hee-Cheol Kim
Author(s): Donghae Seo, Minyoung You, Gil Young Cho, and Hee-Cheol Kim

We present an efficient method to compute the modular extension of both fermionic topological orders and ${\mathbb{Z}}_{2}$-symmetric bosonic topological orders in two spatial dimensions, from congruence representations of ${\mathrm{SL}}_{2}(\mathbb{Z})$ and its subgroups. To demonstrate the validit…


[Phys. Rev. B 109, 155105] Published Tue Apr 02, 2024

Quantum oscillations in an excitonic insulating electron-hole bilayer
Yuelin Shao and Xi Dai
Author(s): Yuelin Shao and Xi Dai

We study the quantum oscillations of interlayer capacitance in an excitonic insulating electron-hole double layer with the Hartree-Fock mean-field theory. Such oscillations could be simply understood from the physical picture of an exciton formed by electron and hole Landau levels, in which the dire…


[Phys. Rev. B 109, 155107] Published Tue Apr 02, 2024

Path integral approach to quantum anomalies in interacting models
Alireza Parhizkar, Colin Rylands, and Victor Galitski
Author(s): Alireza Parhizkar, Colin Rylands, and Victor Galitski

The prediction and subsequent discovery of topological semimetal phases of matter in solid state systems has instigated a surge of activity investigating the exotic properties of these unusual materials. Among these are transport signatures which can be attributed to the chiral anomaly; the breaking…


[Phys. Rev. B 109, 155109] Published Tue Apr 02, 2024

Fermionic skyrmions and bosonization for a Gross-Neveu transition
Xiao Yan Xu and Tarun Grover
Author(s): Xiao Yan Xu and Tarun Grover

We investigate a $2+1\mathrm{D}$ interacting Dirac semimetal with on-site flavor SU(2) symmetry. Topological considerations imply that the skyrmions in the flavor-symmetry-breaking phase carry electron quantum numbers, motivating a dual bosonized low-energy description in terms of two complex scalar…


[Phys. Rev. B 109, 155112] Published Tue Apr 02, 2024

Directional light emission from ${\mathrm{WS}}_{2}$ monolayer driven by self-hybridized van der Waals nanoresonator
Shiyu Shen, Haojie Zhou, Peng Xie, Qi Ding, Ling Yue, Jinglei Du, Hong Zhang, and Wei Wang
Author(s): Shiyu Shen, Haojie Zhou, Peng Xie, Qi Ding, Ling Yue, Jinglei Du, Hong Zhang, and Wei Wang

Bulk transition-metal dichalcogenides (TMDs) materials are becoming attractive candidates for the study of light-matter interactions and manipulation of light emission due to its surprisingly high refractive index in visible to infrared range. Here, we propose a nanoresonator composed of bulk tungst…


[Phys. Rev. B 109, 155405] Published Tue Apr 02, 2024

Superconducting transition temperatures of pure vanadium and vanadium-titanium alloys in the presence of dynamical electronic correlations
D. Jones, A. Östlin, A. Weh, F. Beiuşeanu, U. Eckern, L. Vitos, and L. Chioncel
Author(s): D. Jones, A. Östlin, A. Weh, F. Beiuşeanu, U. Eckern, L. Vitos, and L. Chioncel

Ordinary superconductors are widely assumed insensitive to small concentrations of random nonmagnetic impurities, whereas strong disorder suppresses superconductivity, ultimately leading to a superconductor-insulator transition. In between these limiting cases, a most fascinating regime may emerge w…


[Phys. Rev. B 109, 165107] Published Tue Apr 02, 2024

Magnetic field induced partially polarized chiral spin liquid in a transition metal dichalcogenide moiré system
Yixuan Huang, D. N. Sheng, and Jian-Xin Zhu
Author(s): Yixuan Huang, D. N. Sheng, and Jian-Xin Zhu

As one of the most intriguing states of matter, the chiral spin liquid (CSL) has attracted much scientific interest while its existence and mechanism in crystalline strongly correlated systems remain hotly debated. On the other hand, strong correlation driven emergent phenomena can be realized in tw…


[Phys. Rev. B 109, 165109] Published Tue Apr 02, 2024

Dynamical characterization of ${\mathcal{Z}}_{2}$ Floquet topological phases via quantum quenches
Lin Zhang
Author(s): Lin Zhang

The complete characterization of a generic $d$-dimensional Floquet topological phase is usually hard for the requirement of information about the micromotion throughout the entire driving period. In a recent work [L. Zhang et al., Phys. Rev. Lett. 125, 183001 (2020)], an experimentally feasible dyn…


[Phys. Rev. B 109, 165110] Published Tue Apr 02, 2024

Foliated field theories and multipole symmetries
Hiromi Ebisu, Masazumi Honda, and Taiichi Nakanishi
Author(s): Hiromi Ebisu, Masazumi Honda, and Taiichi Nakanishi

Due to the recent studies of the fracton topological phases, the host of which deconfined quasiparticle excitations with mobility restrictions, the concept of symmetries has been updated. Focusing on one of these new symmetries, multipole symmetries, including global, dipole, and quadruple symmetrie…


[Phys. Rev. B 109, 165112] Published Tue Apr 02, 2024

Found 5 papers in prl
Date of feed: Wed, 03 Apr 2024 03:17:01 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)

Chiral Gauge Theory at the Boundary between Topological Phases
David B. Kaplan
Author(s): David B. Kaplan

David Kaplan has developed a lattice model for particles that are left- or right-handed, offering a firmer foundation for the theory of weak interactions.


[Phys. Rev. Lett. 132, 141603] Published Tue Apr 02, 2024

Weyl Fermions on a Finite Lattice
David B. Kaplan and Srimoyee Sen
Author(s): David B. Kaplan and Srimoyee Sen

David Kaplan has developed a lattice model for particles that are left- or right-handed, offering a firmer foundation for the theory of weak interactions.


[Phys. Rev. Lett. 132, 141604] Published Tue Apr 02, 2024

Bound-Extended Mode Transition in Type-II Synthetic Photonic Weyl Heterostructures
Wange Song, Zhiyuan Lin, Jitao Ji, Jiacheng Sun, Chen Chen, Shengjie Wu, Chunyu Huang, Luqi Yuan, Shining Zhu, and Tao Li
Author(s): Wange Song, Zhiyuan Lin, Jitao Ji, Jiacheng Sun, Chen Chen, Shengjie Wu, Chunyu Huang, Luqi Yuan, Shining Zhu, and Tao Li

Photonic structures with Weyl points (WPs), including type I and type II, promise nontrivial surface modes and intriguing light manipulations for their three-dimensional topological bands. While previous studies mainly focus on exploring WPs in a uniform Weyl structure, here we establish Weyl hetero…


[Phys. Rev. Lett. 132, 143801] Published Tue Apr 02, 2024

Direct Evidence of Klein and Anti-Klein Tunneling of Graphitic Electrons in a Corbino Geometry
Mirza M. Elahi, Hamed Vakili, Yihang Zeng, Cory R. Dean, and Avik W. Ghosh
Author(s): Mirza M. Elahi, Hamed Vakili, Yihang Zeng, Cory R. Dean, and Avik W. Ghosh

Graphene is the setting for the first demonstration of relativistic electrons’ paradoxical ability to whiz through a barrier, provided the barrier is high enough.


[Phys. Rev. Lett. 132, 146302] Published Tue Apr 02, 2024

Exchange-Driven Chern States in High-Mobility Intrinsic Magnetic Topological Insulators
Su Kong Chong, Chao Lei, Yang Cheng, Seng Huat Lee, Zhiqiang Mao, Allan H. MacDonald, and Kang L. Wang
Author(s): Su Kong Chong, Chao Lei, Yang Cheng, Seng Huat Lee, Zhiqiang Mao, Allan H. MacDonald, and Kang L. Wang

The layer-dependent Chern number ($C$) in ${\mathrm{MnBi}}_{2}{\mathrm{Te}}_{4}$ is characterized by the presence of a Weyl semimetal state in the ferromagnetic coupling. However, the influence of a key factor, namely, the exchange coupling, remains unexplored. This study focuses on characterizing t…


[Phys. Rev. Lett. 132, 146601] Published Tue Apr 02, 2024

Found 3 papers in pr_res
Date of feed: Wed, 03 Apr 2024 03:17:01 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)

Realizing efficient topological temporal pumping in electrical circuits
Alexander Stegmaier, Hauke Brand, Stefan Imhof, Alexander Fritzsche, Tobias Helbig, Tobias Hofmann, Igor Boettcher, Martin Greiter, Ching Hua Lee, Gaurav Bahl, Alexander Szameit, Tobias Kießling, Ronny Thomale, and Lavi K. Upreti
Author(s): Alexander Stegmaier, Hauke Brand, Stefan Imhof, Alexander Fritzsche, Tobias Helbig, Tobias Hofmann, Igor Boettcher, Martin Greiter, Ching Hua Lee, Gaurav Bahl, Alexander Szameit, Tobias Kießling, Ronny Thomale, and Lavi K. Upreti

Quantized adiabatic transport can occur when a system is slowly modulated over time. In most realizations, however, the efficiency of such transport is reduced by unwanted dissipation, back-scattering, and nonadiabatic effects. In this paper, we realize a topological adiabatic pump in an electrical …


[Phys. Rev. Research 6, 023010] Published Tue Apr 02, 2024

Microwave-tunable diode effect in asymmetric SQUIDs with topological Josephson junctions
Joseph J. Cuozzo, Wei Pan, Javad Shabani, and Enrico Rossi
Author(s): Joseph J. Cuozzo, Wei Pan, Javad Shabani, and Enrico Rossi

In superconducting systems in which inversion and time-reversal symmetry are simultaneously broken the critical current for positive and negative current bias can be different. For superconducting systems formed by Josephson junctions (JJs) this effect is termed Josephson diode effect. In this paper…


[Phys. Rev. Research 6, 023011] Published Tue Apr 02, 2024

Closed and open unbalanced Dicke trimer model: Critical properties and nonlinear semiclassical dynamics
Cheng Zhang, Pengfei Liang, Neill Lambert, and Mauro Cirio
Author(s): Cheng Zhang, Pengfei Liang, Neill Lambert, and Mauro Cirio

We study a generalization of a recently introduced Dicke trimer model [Phys. Rev. Lett. 128, 163601 (2022); Phys. Rev. Res. 5, L042016 (2023)], which allows for cavity losses and unbalanced light-matter interactions (in which rotating and counter-rotating terms can be tuned independently). In the or…


[Phys. Rev. Research 6, 023012] Published Tue Apr 02, 2024

Found 1 papers in sci-rep


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)

Interplay between tie strength and neighbourhood topology in complex networks
Piotr Fronczak

Scientific Reports, Published online: 03 April 2024; doi:10.1038/s41598-024-58357-4

Interplay between tie strength and neighbourhood topology in complex networks

Found 3 papers in small
Date of feed: Tue, 02 Apr 2024 20:41:20 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)

Resonant Raman Scattering Study of Strain and Defects in Chemical Vapor Deposition Grown MoS2 Monolayers
Rafael N. Gontijo, Nathaniel Bunker, Samarra L. Graiser, Xintong Ding, Manuel Smeu, Ana Laura Elías
Small, EarlyView.

Wafer‐Scale Atomic Assembly for 2D Multinary Transition Metal Dichalcogenides for Visible and NIR Photodetection
Hye Yoon Jeon, Da Som Song, RoSa Shin, Yeong Min Kwon, Hyeong‐ku Jo, Do Hyung Lee, Eunji Lee, Moonjeong Jang, Hee‐Soo So, Saewon Kang, Soonmin Yim, Sung Myung, Sun Sook Lee, Dae Ho Yoon, Chang Gyoun Kim, Jongsun Lim, Wooseok Song
Small, EarlyView.

Tuning Electrons Migration of Dual S Defects Mediated MoS2‐x/ZnIn2S4‐x Toward Highly Efficient Photocatalytic Hydrogen Production
Yifan Zheng, Yu Wang, Seemal Mansoor, Zixu Hu, Yuxin Zhang, Yongdi Liu, Liang Zhou, Juying Lei, Jinlong Zhang
Small, EarlyView.

Found 1 papers in adv-mater
Date of feed: Tue, 02 Apr 2024 20:08:22 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)

Mechanical Control of Quantum Transport in Graphene
Andrew C. McRae, Guoqing Wei, Linxiang Huang, Serap Yigen, Vahid Tayari, Alexandre R. Champagne
Advanced Materials, Accepted Article.