Found 27 papers in cond-mat
Date of feed: Wed, 31 Jan 2024 01:30:00 GMT

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Optimization of scandium oxide growth by high pressure sputtering on silicon. (arXiv:2401.16489v1 [cond-mat.mtrl-sci])
Pedro Carlos Feijoo, María Ángela Pampillón, Enrique San Andrés, María Luisa Lucía

This work demonstrates the viability of scandium oxide deposition on silicon by means of high pressure sputtering. Deposition pressure and radio frequency power are varied for optimization of the properties of the thin films and the ScOx-Si interface. The physical characterization was performed by ellipsometry, Fourier transform infrared spectroscopy, x-ray diffraction and transmission electron microscopy. Aluminum gate electrodes were evaporated for metal-insulator-semiconductor (MIS) fabrication. From the electrical characterization of the MIS devices, the density of interfacial defects is found to decrease with deposition pressure, showing a reduced plasma damage of the substrate surface for higher pressures. This is also supported by lower flatband voltage shifts in the capacitance versus voltage hysteresis curves. Sputtering at high pressures (above 100 Pa) reduces the interfacial SiOx formation, according to the infrared spectra. The growth rates decrease with deposition pressure, so a very accurate control of the layer thicknesses could be provided.

Optimization of gadolinium oxide growth deposited on Si by high pressure sputtering. (arXiv:2401.16499v1 [cond-mat.mtrl-sci])
Pedro Carlos Feijoo, María Ángela Pampillón, Enrique San Andrés

High k gadolinium oxide thin layers were deposited on silicon by high-pressure sputtering (HPS). In order to optimize the properties for microelectronic applications, different deposition conditions were used. Ti (scavenger) and Pt (nonreactive) were e-beam evaporated to fabricate metal-insulator-semiconductor (MIS) devices. According to x-ray diffraction, x-ray photoelectron spectroscopy, and Fourier-transform infrared spectroscopy, policrystaline stoichiometric Gd2O3 films were obtained by HPS. MIS with the dielctric deposited at higher pressures also present lower flatband voltage shifts in the C-V hysteris curves.

Two-step conversion of metal and metal oxide precursor films to 2D transition metal dichalcogenides and heterostructures. (arXiv:2401.16513v1 [cond-mat.mtrl-sci])
Michael Altvater, Christopher Muratore, Michael Snure, Nicholas Glavin

From the laboratory to real-world applications, synthesis of two dimensional (2D) materials requires modular techniques to control morphology, structure, chemistry, and the plethora of exciting properties arising from these nanoscale materials. In this review, we explore one of the many available synthesis techniques; the extremely versatile two-step conversion (2SC) method. The 2SC technique relies on deposition of a metal or metal oxide film, followed by reaction with a chalcogen vapor at an elevated temperature, converting the precursor film to a crystalline transition metal dichalcogenide (TMD). Herein, we consider the variables at each step of the 2SC process including the impact of the precursor film material and deposition technique, the influence of gas composition and temperature during conversion, as well as other factors controlling high quality 2D TMD synthesis. We feature the specific advantages to the 2SC approach including deposition on diverse substrates, low temperature processing, orientation control, and heterostructure synthesis, among others. Finally, emergent opportunities that take advantage of the 2SC approach are discussed to include next generation electronics, sensing, and optoelectronic devices as well as catalysis for energy-related applications; spotlighting the great potential of the 2SC technique.

Ultra-low glassy thermal conductivity and controllable, promising thermoelectric properties in crystalline o-CsCu5S3. (arXiv:2401.16527v1 [cond-mat.mtrl-sci])
Jincheng Yue, Jiongzhi Zheng, Junda Li, Siqi Guo, Wenling Ren, Han Liu, Yanhui Liu, Tian Cui

We thoroughly investigate the microscopic mechanisms of the thermal transport in orthorhombic \textit{o}-CsCu$_5$S$_3$ by integrating the first-principles-based self-consistent phonon calculations (SCP) with the linearized Wigner transport equation (LWTE). Our methodology takes into account contributions to phonon energy shifts and phonon scattering rates from both three- and four-phonon processes. Additionally, it incorporates the off-diagonal terms of heat flux operators to calculate the total thermal conductivity. The predicted $\kappa_\mathrm{L}$ with an extremely weak temperature dependence following $\sim T^{-0.33}$, in good agreement with experimental values along with the parallel to the Bridgman growth direction. Such nonstandard temperature dependence of $\kappa_\mathrm{L}$ can be traced back to the dual particlelike-wavelike behavior exhibited by thermal phonons. Specifically, the coexistence of the stochastic oscillation of Cs atoms and metavalent bonding among interlayer Cu-S atoms limits the particle-like phonon propagation and enhances the wave-like tunneling of phonons. Simultaneously, the electrical transport properties are determined by employing a precise momentum relaxation-time approximation (MRTA) within the framework of the linearized Boltzmann transport equation (LBTE). By properly adjusting the carrier concentration, excellent thermoelectric performance is achieved, with a maximum thermoelectric conversion efficiency of 18.4$\%$ observed at 800 K in \textit{p}-type \textit{o}-CsCu$_5$S$_3$.} Our work not only elucidates the anomalous thermal transport behavior in the copper-based chalcogenide \textit{o}-CsCu$_5$S$_3$ but also provides insights for manipulating its thermal and electronic properties for potential thermoelectric applications.

A Loop-Opening Model for the Intrinsic Fracture Energy of Polymer Networks. (arXiv:2401.16607v1 [cond-mat.mtrl-sci])
Shu Wang, Chase M. Hartquist, Bolei Deng, Xuanhe Zhao

We present a loop-opening model that accounts for the molecular details of the intrinsic fracture energy for fracturing polymer networks. This model includes not only the energy released from the scission of bridging chains but also the subsequent energy released from the network continuum. Scission of a bridging chain releases the crosslinks and opens the corresponding topological loop. The released crosslinks will be caught by the opened loop to reach a new force-balanced state. The amount of energy released from the network continuum is limited by the stretchability of the opened loop. Based on this loop-opening process, we suggest that the intrinsics fracture energy per broken chain approximately scales with the product of the fracture force and the contour length of the opened loop. This model predicts an intrinsic fracture energy that aligns well with various experimental data on the fracture of polymer networks.

Canted antiferromagnetism in a spin-orbit coupled $S_{\text{eff}} = 3/2$ triangular-lattice magnet DyAuGe. (arXiv:2401.16622v1 [cond-mat.str-el])
Takashi Kurumaji, Masaki Gen, Shunsuke Kitou, Hajime Sagayama, Hironori Nakao, Taka-hisa Arima

Exploration of nontrivial magnetic states induced by strong spin-orbit interaction is a central topic of frustrated magnetism. Extensive studies are concentrated on rare-earth-based magnets and 4d/5d transition metal compounds, which are mostly described by an effective spin $S_{\text{eff}} = 1/2$ for the Kramers doublet of the lowest crystal-electric-field levels. Variety of magnetic orderings may be greatly enhanced when magnetic dipolar moments intertwined with multipolar degrees of freedom which are described by higher-rank tensors and often require the magnetic ions with $S_{\text{eff}} > 1/2$. Here, our synchrotron x-ray diffraction near the Dy $L_3$ edge has unveiled a canted antiferromagnetic ground state arising from a quasi-quartet ($S_{\text{eff}} = 3/2$) of 4f electrons in a triangular-lattice (TL) rare-earth intermetallics DyAuGe. Magnetic moment and electric-quadrupole moment are closely interlocked and noncollinear magnetic-dipole alignment is induced by antiferroic electric-quadrupole (AFQ) ordering in the TL layers. The correlation between the AFQ and canted magnetic structures is further confirmed by phase transitions in an in-plane magnetic field. These findings offer insights into the emergence of nontrivial magnetic states in frustrated TL systems described beyond the $S_{\text{eff}} = 1/2$.

Evidence of electron correlation and unusual spectral evolution in an exotic superconductor, PdTe. (arXiv:2401.16724v1 [cond-mat.supr-con])
Ram Prakash Pandeya, Arindam Pramanik, Pramita Mishra, Indranil Sarkar, A. Thamizhavel, Kalobaran Maiti

We study the electronic structure of an exotic superconductor, PdTe employing depth-resolved high resolution photoemission spectroscopy and density functional theory. The valence band spectra exhibit large density of states at the Fermi level with flat intensity in a wide energy range indicating highly metallic ground state. The Pd 4d-Te 5p hybridization is found to be strong leading to a highly covalent character of the itinerant states. Core level spectra exhibit several features including the signature of plasmon excitations. Although the radial extension of the 4d orbitals is larger than 3d ones, the Pd core level spectra exhibit distinct satellites indicating importance of electron correlation in the electronic structure which may be a reason for unconventional superconductivity observed in this system. The depth-resolved data reveal surface peaks at higher binding energies in both, Te and Pd core level spectra. Interestingly, core level shift in Te-case is significantly large compared to Pd although Te is relatively more electronegative. Detailed analysis rules out applicability of the charge transfer and/or band-narrowing models to capture this scenario. This unusual scenario is attributed to the reconstruction and/or vacancies at the surface. These results reveal the importance of electron correlation and surface topology for the physics of this material exhibiting Dirac fermions and complex superconductivity.

Unexpected linear conductivity in Landau-Zener model: limitations and improvements of the relaxation time approximation in the quantum master equation. (arXiv:2401.16728v1 [cond-mat.mes-hall])
Ibuki Terada, Sota Kitamura, Hiroshi Watanabe, Hiroaki Ikeda

The nonequilibrium steady states of quantum materials have many challenges. Here, we highlight issues with the relaxation time approximation (RTA) for the DC conductivity in insulating systems. The RTA to the quantum master equation (QME) is frequently employed as a simple method, yet this phenomenological approach is exposed as a fatal approximation, displaying metallic DC conductivity in insulating systems within the linear response regime. We find that the unexpected metallic behavior is caused by the fact that the density matrix in the RTA incompletely incorporates the first order of the external field. To solve this problem, we have derived a new calculation scheme based on the QME that ensure correct behavior in low electric fields. Our method reproduces well the overall features of the exact electric currents in the whole field region. It is not time-consuming, and its application to lattice systems is straightforward. This method will encourage progress in this research area as a simple way to more accurately describe nonequilibrium steady states.

Formation of highly stable interfacial nitrogen gas hydrate overlayers under ambient conditions. (arXiv:2401.16737v1 [cond-mat.mtrl-sci])
Chung-Kai Fang, Cheng-Hao Chuang, Chih-Wen Yang, Zheng-Rong Guo, Wei-Hao Hsu, Chia-Hsin Wang, Ing-Shouh Hwang

Surfaces (interfaces) dictate many physical and chemical properties of solid materials and adsorbates considerably affect these properties. Nitrogen molecules, which are the most abundant constituent in ambient air, are considered to be inert. Our study combining atomic force microscopy (AFM), X-ray photoemission spectroscopy (XPS), and thermal desorption spectroscopy (TDS) revealed that nitrogen and water molecules can self-assemble into two-dimensional domains, forming ordered stripe structures on graphitic surfaces in both water and ambient air. The stripe structures of this study were composed of approximately 90% and 10% water and nitrogen molecules, respectively, and survived in ultra-high vacuum (UHV) conditions at temperatures up to approximately 350 K. Because pure water molecules completely desorb from graphitic surfaces in a UHV at temperatures lower than 200 K, our results indicate that the incorporation of nitrogen molecules substantially enhanced the stability of the crystalline water hydrogen bonding network. Additional studies on interfacial gas hydrates can provide deeper insight into the mechanisms underlying formation of gas hydrates.

Heavy-fermions in frustrated Hund's metal with portions of incipient flat-bands. (arXiv:2401.16770v1 [cond-mat.str-el])
Yilin Wang

Flat-bands induced by destructive interference of hoppings in frustrated lattices such as kagome metals, have been extensively studied in recent years since they may lead to strongly correlated phenomena. However, in realistic multiorbital $d$-electron materials, such flat-bands usually appear in small portions of Brillouin zone and are away from Fermi level (dubbed as ``incipient"). Whether such incipient flat-band portions can induce very strong electron correlations is an open question. Here, by density functional theory plus dynamical mean-field theory calculations on the superconducting kagome CsCr$_3$Sb$_5$ and triangular CrB$_2$, we show that the roles of such incipient flat-bands in driving electron correlations can be significantly amplified by Hund's coupling $J_{\text{H}}$ in a Hund's metal. As a result, even moderately $d$-electron heavy-fermions could be induced by enhancing the orbital differentiation and Kondo-like effect of Hund's metals. This provides a flexible route for generating $d$-electron heavy-fermion, and for controllably inducing electron correlations and magnetic fluctuations suitable for emergence of unconventional superconductivity, in frustrated Hund's metals with portions of incipient flat-bands.

Vanadium-Doped Molybdenum Disulfide Monolayers with Tunable Electronic and Magnetic Properties: Do Vanadium-Vacancy Pairs Matter?. (arXiv:2401.16806v1 [cond-mat.mtrl-sci])
Da Zhou, Yen Thi Hai Pham, Diem Thi-Xuan Dang, David Sanchez, Aaryan Oberoi, Ke Wang, Andres Fest, Alexander Sredenschek, Mingzu Liu, Humberto Terrones, Saptarshi Das, Dai-Nam Le, Lilia M. Woods, Manh-Huong Phan, Mauricio Terrones

Monolayers of molybdenum disulfide (MoS2) are the most studied two-dimensional (2D) transition-metal dichalcogenides (TMDs), due to its exceptional optical, electronic, and opto-electronic properties. Recent studies have shown the possibility of incorporating a small amount of magnetic transition metals (e.g., Fe, Co, Mn, V) into MoS2 to form a 2D dilute magnetic semiconductor (2D-DMS). However, the origin of the observed ferromagnetism has remained elusive, due to the presence of randomly generated sulfur vacancies during synthesis that can pair with magnetic dopants to form complex dopant-vacancy configurations altering the magnetic order induced by the dopants. By combining high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) imaging with first-principles density functional theory (DFT) calculations and magnetometry data, we demonstrate the critical effects of sulfur vacancies and their pairings with vanadium atoms on the magnetic ordering in V-doped MoS2 (V-MoS2) monolayers. Additionally, we fabricated a series of field effect transistors on these V-MoS2 monolayers and observed the emergence of p-type behavior as the vanadium concentration increased. Our study sheds light on the origin of ferromagnetism in V-MoS2 monolayers and provides a foundation for future research on defect engineering to tune the electronic and magnetic properties of atomically thin TMD-based DMSs.

Molecular Beam Epitaxy of GaN Nanowires on Epitaxial Graphene. (arXiv:2401.16874v1 [cond-mat.mtrl-sci])
Sergio Fernández-Garrido, Manfred Ramsteiner, Guanhui Gao, Lauren A.Galves, Bharat Sharma, Pierre Corfdir, Gabriele Calabrese, Ziani de Souza Schiaber, Carsten Pfüller, Achim Trampert, João Marcelo J. Lopes, Oliver Brandt, Lutz Geelhaar

We demonstrate an all-epitaxial and scalable growth approach to fabricate single-crystalline GaN nanowires on graphene by plasma-assisted molecular beam epitaxy. As substrate, we explore several types of epitaxial graphene layer structures synthesized on SiC. The different structures differ mainly in their total number of graphene layers. Because graphene is found to be etched under active N exposure, the direct growth of GaN nanowires on graphene is only achieved on multilayer graphene structures. The analysis of the nanowire ensembles prepared on multilayer graphene by Raman spectroscopy and transmission electron microscopy reveals the presence of graphene underneath as well as in between nanowires, as desired for the use of this material as contact layer in nanowire-based devices. The nanowires nucleate preferentially at step edges, are vertical, well aligned, epitaxial, and of comparable structural quality as similar structures fabricated on conventional substrates.

Exploring the giant dynamical Franz-Keldysh effect in massless Dirac materials. (arXiv:2401.16898v1 [cond-mat.mes-hall])
Youngjae Kim

The dynamical Franz-Keldysh effect, indicative of the transient light-matter interaction regime between quantum and classical realms, is widely recognized as an essential signature in wide bandgap condensed matter systems such as dielectrics. In this study, we applied the time-resolved transient absorption spectroscopy to investigate ultrafast optical responses in graphene, a zero-bandgap system. We observed in the gate-tuned graphene that the massless Dirac materials notably enhance intraband light-driven transitions, significantly leading to the giant dynamical Franz-Keldysh effect compared to the massive Dirac materials, a wide bandgap system. In addition, employing the angle-resolved spectroscopy, it is found that the perpendicular polarization orientation for the pump and the probe further pronounces the optical spectra to exhibit the complete fishbone structure, reflecting the unique pseudospin nature of Dirac cones. Our findings expand the establishment of emergent transient spectroscopy frameworks into not only zero-bandgap systems but also pseudospin-mediated quantum phenomena, moving beyond dielectrics.

Tunable high-temperature tunneling magnetoresistance in all-van der Waals antiferromagnet/semiconductor/ferromagnet junctions. (arXiv:2401.16984v1 [cond-mat.mtrl-sci])
Wen Jin, Xinlu Li, Gaojie Zhang, Hao Wu, Xiaokun Wen, Li Yang, Jie Yu, Bichen Xiao, Wenfeng Zhang, Jia Zhang, Haixin Chang

Magnetic tunnel junctions (MTJs) have been widely applied in spintronic devices for efficient spin detection through the imbalance of spin polarization at the Fermi level. The van der Waals (vdW) nature of two-dimensional (2D) magnets with atomic-scale flat surfaces and negligible surface roughness greatly facilitates the development of MTJs, yet is only restricted to ferromagnets. Here, we report A-type antiferromagnetism in 2D vdW single-crystal (Fe0.8Co0.2)3GaTe2 with TN~203 K in bulk and ~185 K in 9-nm nanosheets. The metallic nature and out-of-plane magnetic anisotropy make it a suitable candidate for MTJ electrodes. By constructing heterostructures based on (Fe0.8Co0.2)3GaTe2/WSe2/Fe3GaTe2, we obtain a large tunneling magnetoresistance (TMR) ratio of 180% at low temperature and the TMR retains at near-room temperature 280 K. Moreover, the TMR is tunable by the electric field down to 1 mV, implying the potential in energy-efficient spintronic devices. Our work provides new opportunities for 2D antiferromagnetic spintronics and quantum devices.

Anomalous photo-induced band renormalization in correlated materials: Case study of Ta$_2$NiSe$_5$. (arXiv:2401.16988v1 [cond-mat.str-el])
Lei Geng, Xiulan Liu, Jianing Zhang, Denis Golež, Liang-You Peng

We investigate the anomalous photo-induced band renormalization in correlated materials, exemplified by the case of Ta$_2$NiSe$_5$. The manifestation of this anomaly is characterized by the alternating direction of band shift in response to changes in the laser parameters or electron momentum. We attribute the phenomena to the band inversion of the material and the selective excitation of a high-lying flat band, leading to the competition between the Hartree shift and the order collapse. These findings are based on {\it ab initio} determined effective model for Ta$_2$NiSe$_5$, in which we incorporate high-lying states and the time-dependent GW simulation to follow the non-equilibrium dynamics induced by the laser. Our findings reveal the sensitivity of the non-equilibrium electronic dynamics to the band structure and laser protocols, providing valuable guidance for the selection of suitable materials and lasers in the engineering of band structures.

Unprecedentedly large superconducting gap in HgBa$_2$Ca$_2$Cu$_3$O$_{8+\delta}$ with the highest $T_c$ at ambient pressure. (arXiv:2401.17079v1 [cond-mat.supr-con])
Chuanhao Wen, Zhiyong Hou, Alireza Akbari, Kailun Chen, Wenshan Hong, Huan Yang, Ilya Eremin, Yuan Li, Hai-Hu Wen

In cuprate superconductors, the highest superconducting transition temperature $T_c$ is possessed by the HgBa$_2$Ca$_2$Cu$_3$O$_{8+\delta}$ (Hg-1223) system at ambient pressure, but the reason remains elusive. Here we report the scanning tunneling microscope measurements on the Hg-1223 single crystals with $T_c$ = 134 K. The observed superconducting gaps determined from the tunneling spectra can be categorized into two groups: the smaller gap $\Delta_1$ ranges from about 45 to 70 meV, while the larger gap $\Delta_2$ from about 65 to 98 meV. The observed unprecedentedly large gap value gives a straightforward explanation to the highest $T_c$ in the Hg-1223 system. The largest gap observed here is comparable to the magnetic superexchange energy and excludes any possibility of using phonon pictures to interpret the superconductivity. Interestingly, an extremely strong particle-hole asymmetry is observed in associating with a very robust coherence peak at the bias of the larger gap in the hole branch of the Bogoliubov dispersion. We propose that the observed asymmetry results from the interplay of a flat band (van Hove singularity) in the electronic spectrum and the large superconducting gap in the underdoped layer. This could be the main reason for the strong pairing, and significant enhancement of the density of states in the hole branch of the Bogoliubov band yielding strong phase coherence of Cooper pairs. A scenario based on a trilayer model with an interlayer coupling can give a reasonable explanation. Our results provide deep insight into understanding the mechanism of superconductivity in cuprate superconductors.

Incipient nematicity from electron flat bands in a kagome metal. (arXiv:2401.17141v1 [cond-mat.str-el])
Nathan Drucker, Thanh Nguyen, Manasi Mandal, Phum Siriviboon, Yujie Quan, Artittaya Boonkird, Ryotaro Okabe, Fankang Li, Kaleb Buragge, Fumiaki Funuma, Masaaki Matsuda, Douglas Abernathy, Travis Williams, Songxue Chi, Feng Ye, Christie Nelson, Bolin Liao, Pavel Volkov, Mingda Li

Engineering new quantum phases requires fine tuning of the electronic, orbital, spin, and lattice degrees of freedom. To this end, the kagome lattice with flat bands has garnered great attention by hosting various topological and correlated phases, when the flat band is at the Fermi level. Here we discover unconventional nematiciy in kagome metal CoSn, where flat bands are fully occupied below the Fermi level. Thermodynamic, dilatometry, resonant X-ray scattering, inelastic neutron scattering, Larmor diffraction, and thermoelectric measurements consistently hint at rotational symmetry-breaking and nematic order that is pronounced only near T=225 K. These observations, principally the nematic's finite temperature stability -- incipience -- can be explained by a phenomenological model which reveals that thermally excited flat bands promote symmetry breaking at a characteristic temperature. Our work shows that thermal fluctuations, which are typically detrimental for correlated electron phases, can induce new ordered states of matter, avoiding the requirements for fine tuning of electronic bands.

Active Fluidification of Entangled Polymers by Loop Extrusion. (arXiv:2401.17232v1 [cond-mat.soft])
Filippo Conforto, Yair Augusto Gutierrez Fosado, Davide Michieletto

Loop extrusion is one of the main processes shaping chromosome organisation across the cell cycle, yet its role in regulating DNA entanglement and nucleoplasm viscoelasticty remains overlooked. We simulate entangled solutions of linear polymers under the action of generic Loop Extruding Factors (LEF) with a model that fully accounts for topological constraints and LEF-DNA uncrossability. We discover that extrusion drives the formation of bottle-brush-like structures which significantly lower the entanglement and effective viscosity of the system through an active fluidification mechanism. Interestingly, this fluidification displays an optimum at one LEF every 300-3000 basepairs. In marked contrast with entangled linear chains, the viscosity of extruded chains scales linearly with polymer length, yielding up to 1000-fold fluidification. Our results illuminate how loop extrusion contributes to actively modulate genome entanglement and viscoelasticity in vivo.

Merged-log-concavity of rational functions, almost strictly unimodal sequences, and phase transitions of ideal boson-fermion gases. (arXiv:2003.02112v2 [math.CO] UPDATED)
So Okada

We obtain some new results on the unimodal sequences of the real values of rational functions by polynomials with positive integer coefficients. Thus, we introduce the notion of merged-log-concavity of rational functions. Roughly speaking, the notion extends Stanley's $q$-log-concavity of polynomials.

We construct explicit merged-log-concave rational functions by $q$-binomial coefficients, Hadamard products, and convolutions, extending the Cauchy-Binet formula. Then, we obtain the unimodal sequences of rational functions by Young diagrams. Moreover, we consider the variation of unimodal sequences by critical points that separate strictly increasing, strictly decreasing, and hill-shape sequences among almost strictly unimodal sequences. Also, the critical points are zeros of polynomials in a suitable setting.

The study above extends the $t$-power series of $(\pm t;q)_{\infty}^{\mp 1}$ to some extent by polynomials with positive integer coefficients and the variation of unimodal sequences. We then obtain the golden ratio of quantum dilogarithms ($q$-exponentials) as a critical point. Additionally, we consider eta products, generalized Narayana numbers, and weighted $q$-multinomial coefficients, which we introduce.

In statistical mechanics, we discuss the grand canonical partition functions of some ideal boson-fermion gases with or without Casimir energies (Ramanujan summation). The merged-log-concavity gives phase transitions on Helmholtz free energies by critical points of the metallic ratios including the golden ratio. In particular, the phase transitions implies non-zero particle vacua from zero particle vacua as the temperature rises.

Non-equilibrium quantum domain reconfiguration dynamics in a two-dimensional electronic crystal: experiments and quantum simulations. (arXiv:2103.07343v4 [quant-ph] UPDATED)
Jaka Vodeb, Michele Diego, Yevhenii Vaskivskyi, Leonard Logaric, Yaroslav Gerasimenko, Viktor Kabanov, Benjamin Lipovsek, Marko Topic, Dragan Mihailovic

Relaxation dynamics of complex many-body quantum systems brought out of equilibrium and subsequently trapped into metastable states is a very active field of research from both the theoretical and experimental point of view with implications in a wide array of topics from macroscopic quantum tunnelling and nucleosynthesis to non-equilibrium superconductivity and new energy-efficient memory devices. Understanding the dynamics of such systems is crucial for exploring fundamental aspects of many-body non-equilibrium quantum physics. In this work we investigate quantum domain reconfiguration dynamics in the electronic superlattice of a quantum material where classical dynamics is topologically constrained. The crossover from temperature to quantum fluctuation dominated dynamics in the context of environmental noise is investigated by directly observing charge reconfiguration with time-resolved scanning tunneling microscopy. The process is modelled using a programmable superconducting quantum simulator in which qubit interconnections correspond directly to the microscopic interactions between electrons in the quantum material. Crucially, the dynamics of both the experiment on the quantum material and the simulation is driven by spectrally similar pink noise. We find that the simulations reproduce the emergent time evolution and temperature dependence of the experimentally observed electronic domain dynamics remarkably well. The combined experiment and simulations lead to a better understanding of noise-driven quantum dynamics in open quantum systems. From a practical viewpoint, the results are important for understanding the origin of the retention time in non-volatile memory devices such as those based on 1T-TaS2.

Towards Non-Invertible Anomalies from Generalized Ising Models. (arXiv:2208.09101v2 [cond-mat.str-el] UPDATED)
Shang Liu, Wenjie Ji

We present a general approach to the bulk-boundary correspondence of noninvertible topological phases, including both topological and fracton orders. This is achieved by a novel bulk construction protocol where solvable $(d+1)$-dimensional bulk models with noninvertible topology are constructed from the so-called generalized Ising (GI) models in $d$ dimensions. The GI models can then terminate on the boundaries of the bulk models. The construction generates abundant examples, including not only prototype ones such as $Z_2$ toric code models in any dimensions no less than two, and the X-cube fracton model, but also more diverse ones such as the $Z_2\times Z_2$ topological order, the 4d $Z_2$ topological order with pure-loop excitations, etc. The boundary of the solvable model is potentially anomalous and corresponds to precisely only sectors of the GI model that host certain total symmetry charges and/or satisfy certain boundary conditions. We derive a concrete condition for such bulk-boundary correspondence. The condition is violated only when the bulk model is either trivial or fracton ordered. A generalized notion of Kramers-Wannier duality plays an important role in the construction. Also, utilizing the duality, we find an example where a single anomalous theory can be realized on the boundaries of two distinct bulk fracton models, a phenomenon not expected in the case of topological orders. More generally, topological orders may also be generated starting with lattice models beyond the GI models, such as those with symmetry protected topological orders, through a variant bulk construction, which we provide in an appendix.

Finding the effective dynamics to make rare events typical in chaotic maps. (arXiv:2304.13754v3 [cond-mat.stat-mech] UPDATED)
Ricardo Gutiérrez, Adrián Canella-Ortiz, Carlos Pérez-Espigares

Dynamical fluctuations or rare events associated with atypical trajectories in chaotic maps due to specific initial conditions can crucially determine their fate, as the may lead to stability islands or regions in phase space otherwise displaying unusual behavior. Yet, finding such initial conditions is a daunting task precisely because of the chaotic nature of the system. In this work, we circumvent this problem by proposing a framework for finding an effective topologically-conjugate map whose typical trajectories correspond to atypical ones of the original map. This is illustrated by means of examples which focus on counterbalancing the instability of fixed points and periodic orbits, as well as on the characterization of a dynamical phase transition involving the finite-time Lyapunov exponent. The procedure parallels that of the application of the generalized Doob transform in the stochastic dynamics of Markov chains, diffusive processes and open quantum systems, which in each case results in a new process having the prescribed statistics in its stationary state. This work thus brings chaotic maps into the growing family of systems whose rare fluctuations -- sustaining prescribed statistics of dynamical observables -- can be characterized and controlled by means of a large-deviation formalism.

Crystal Thermal Transport in Altermagnetic RuO2. (arXiv:2305.01410v2 [cond-mat.mtrl-sci] UPDATED)
Xiaodong Zhou, Wanxiang Feng, Run-Wu Zhang, Libor Smejkal, Jairo Sinova, Yuriy Mokrousov, Yugui Yao

We demonstrate the emergence of a pronounced thermal transport in the recently discovered class of magnetic materials-altermagnets. From symmetry arguments and first-principles calculations performed for the showcase altermagnet, RuO2, we uncover that crystal Nernst and crystal thermal Hall effects in this material are very large and strongly anisotropic with respect to the Neel vector. We find the large crystal thermal transport to originate from three sources of Berry's curvature in momentum space: the Weyl fermions due to crossings between well-separated bands, the strong spin-flip pseudonodal surfaces, and the weak spin-flip ladder transitions, defined by transitions among very weakly spin-split states of similar dispersion crossing the Fermi surface. Moreover, we reveal that the anomalous thermal and electrical transport coefficients in RuO2 are linked by an extended Wiedemann-Franz law in a temperature range much wider than expected for conventional magnets. Our results suggest that altermagnets may assume a leading role in realizing concepts in spin caloritronics not achievable with ferromagnets or antiferromagnets.

Superconductivity from incoherent Cooper pairs in strong-coupling regime. (arXiv:2308.04508v4 [cond-mat.supr-con] UPDATED)
Alexander A. Zyuzin, A. Yu. Zyuzin

We propose a scenario for superconductivity at strong electron-electron attractive interaction, in the situation when the increase of interaction strength promotes the nucleation of the local Cooper pairs and forms a state with a spatially phase incoherent Cooper pair order parameter. We show that this state can be characterized by a pseudogap which is determined by the electron scattering by phase fluctuations. At low temperatures, however, long-range correlations between the regions with different phases become important and establish global phase coherence hence superconductivity in the system. We develop a mean-field theory to describe a phase transition between the preformed Cooper pair and superconducting states. The superconducting transition temperature and the upper critical magnetic field are shown to be enhanced in the strong coupling case. The mean-field approach is justified by the small value of the Ginzburg-Levanyuk parameter. This scenario of superconductivity applies not only to conductors with parabolic bands but also to the flat-band systems in which flat and dispersive bands coexist and responsible for the Cooper pairs formation as well as their phase-synchronization.

High-Order Topological Phase Diagram Revealed by Anomalous Nernst Effect in Janus ScClI Monolayer. (arXiv:2308.07550v3 [cond-mat.mes-hall] UPDATED)
Ning-Jing Yang, Jian-Min Zhang

Higher-order topological properties of two-dimensional(2D) magnetic materials have recently been proposed. In 2D ferromagnetic Janus materials, we find that ScClI is a second-order topological insulator (SOTI). By means of a multi-orbital tight-binding model, we analyze the orbital contributions of higher-order topologies. Further, we give the complete high-order topological phase diagram of ScClI, based on the external field modulation of the magneto-valley coupling and energy levels. 2D ScClI has a pronounced valley polarization, which causes different insulating phases to exhibit completely different anomalous Nernst conductance. As a result, we use the matched anomalous Nernst effect to reveal the topological phase transition process of ScClI. We utilize the characteristics of valley electronics to link higher-order topological materials with the anomalous Nernst effect, which has potential implications for high-order topological insulators and valley electronics.

Effects of internal and external decoherence on the resonant transport and Anderson localization of fermionic particles in the tight-binding chain. (arXiv:2311.05995v2 [cond-mat.mes-hall] UPDATED)
Andrey R. Kolovsky

We study effects of relaxation/decoherence processes on quantum transport of non-interacting Fermi particles across the tight-binding chain, where we distinguish between relaxation processes in the contacts (external decoherence) and those in the chain (internal decoherence). It is argued that relaxation processes in the contacts can essentially modify the resonant transmission as compared to the Landauer theory. We also address quantum transport in disordered chains. It is shown that external decoherence reduces conductance fluctuations but does not alter the Anderson localization length. This is in strong contrast with the effect of internal decoherence which is found to suppress the Anderson localization.

The fate of high winding number topological phases in the disordered extended Su-Schrieffer-Heeger model. (arXiv:2311.11405v2 [cond-mat.str-el] UPDATED)
Emmanuele G. Cinnirella, Andrea Nava, Gabriele Campagnano, Domenico Giuliano

We use the Lindblad equation approach to investigate topological phases hosting more than one localized state at each side of a disordered SSH chain with properly tuned long range hoppings. Inducing a non equilibrium steady state across the chain, we probe the robustness of each phase and the fate of the edge modes looking at the distribution of electrons along the chain and the corresponding standard deviation in the presence of different kinds of disorder either preserving, or not, the symmetries of the Hamiltonian.

Found 12 papers in prb
Date of feed: Wed, 31 Jan 2024 04:17:10 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)

Variational density functional perturbation theory for metals
Xavier Gonze, Samare Rostami, and Christian Tantardini
Author(s): Xavier Gonze, Samare Rostami, and Christian Tantardini

Density Functional Perturbation Theory (DFPT) is a proven method for analyzing molecular and solid responses to perturbations. For metals, challenges arise due to Fermi-Dirac statistics and electronic bands crossing the Fermi energy. This work focuses on variational DFPT for metals, examining the convexity of the entropy function of occupation numbers. It emphasizes benefits from resmearing Fermi-Dirac broadening at finite temperature, details variational expressions for free energy derivatives, and addresses inaccuracies in unperturbed wavefunctions. The formalism is implemented in the ABINIT software.

[Phys. Rev. B 109, 014317] Published Tue Jan 30, 2024

Thermodynamics and fractal dynamics of a nematic spin ice: A doubly frustrated pyrochlore Ising magnet
Jonathan N. Hallén, Claudio Castelnovo, and Roderich Moessner
Author(s): Jonathan N. Hallén, Claudio Castelnovo, and Roderich Moessner

The Ising antiferromagnets on the triangular and on the pyrochlore lattices are two of the most iconic examples of magnetic frustration, paradigmatically illustrating many exotic properties such as emergent gauge fields, fractionalization, and topological order. In this paper, we show that the two i…

[Phys. Rev. B 109, 014438] Published Tue Jan 30, 2024

Laser fluence tunable spin transport and ultrafast demagnetization in ${\mathrm{BiSbTe}}_{1.5}{\mathrm{Se}}_{1.5}/{\mathrm{Co}}_{20}{\mathrm{Fe}}_{60}{\mathrm{B}}_{20}$ bilayers
Suchetana Mukhopadhyay, Pratap Kumar Pal, Subhadip Manna, Chiranjib Mitra, and Anjan Barman
Author(s): Suchetana Mukhopadhyay, Pratap Kumar Pal, Subhadip Manna, Chiranjib Mitra, and Anjan Barman

Topological insulator (TI)/ferromagnet heterostructures hold immense application potential for spin-orbitronic memory technologies owing to strong spin-orbit coupling of TIs combined with ultrahigh spin-charge interconversion efficiency. Here, we use all-optical time-resolved magneto-optical Kerr ef…

[Phys. Rev. B 109, 024437] Published Tue Jan 30, 2024

Topological and magnetic phase transitions in the bilayer Kitaev-Ising model
Aayush Vijayvargia, Urban F. P. Seifert, and Onur Erten
Author(s): Aayush Vijayvargia, Urban F. P. Seifert, and Onur Erten

We investigate the phase diagram of a bilayer Kitaev honeycomb model with Ising interlayer interactions, deriving effective models via perturbation theory and performing Majorana mean-field theory calculations. We show that a diverse array of magnetic and topological phase transitions occur, dependi…

[Phys. Rev. B 109, 024439] Published Tue Jan 30, 2024

Breakdown of chiral edge modes in topological magnon insulators
Jonas Habel, Alexander Mook, Josef Willsher, and Johannes Knolle
Author(s): Jonas Habel, Alexander Mook, Josef Willsher, and Johannes Knolle

Topological magnon edge modes have been proposed for the realization of robust, low-loss spintronic devices. However, ubiquitous many-body interactions that do not preserve particle number significantly compromise their topological protection. The authors show here that these interactions can lead to significant edge mode damping, hybridization with bulk modes, and coupling between edge modes on opposite sides. These findings pose challenges for the experimental realization of topological magnon edge modes, but can be overcome by the application of large magnetic fields.

[Phys. Rev. B 109, 024441] Published Tue Jan 30, 2024

Strain-induced high Chern number topological insulator state in Fe- or V-decorated ${\mathrm{MoS}}_{2}$ monolayers
Siyavash Moradi and Ali Sadeghi
Author(s): Siyavash Moradi and Ali Sadeghi

The electronic structure and topological state of an ${\mathrm{MoS}}_{2}$ monolayer decorated by iron or vanadium adatoms is investigated by first-principles calculations. It is shown that several Chern insulator phases occur in these samples in the presence of external strain or electric field. In …

[Phys. Rev. B 109, 035165] Published Tue Jan 30, 2024

Excellent high-pressure-sustainable thermoelectric performance driven by metal-insulator topological phase transition in semimetal CaCdGe
Liangyu Li, Zhenyu Ding, Rongman Gao, Miao Li, Shuo-Wang Yang, Gang Wu, and Xiaoping Yang
Author(s): Liangyu Li, Zhenyu Ding, Rongman Gao, Miao Li, Shuo-Wang Yang, Gang Wu, and Xiaoping Yang

Recent advances in thermoelectric research have shed light on the promising properties of topological semimetals, which exhibit superior carrier mobility and electrical conductivity compared to traditional thermoelectric materials. Herein, we employ a first-principles method and semiclassical Boltzm…

[Phys. Rev. B 109, 035166] Published Tue Jan 30, 2024

Spatial exciton localization at interfaces of metal nanoparticles and atomically thin semiconductors
Robert Salzwedel, Lara Greten, Stefan Schmidt, Stephen Hughes, Andreas Knorr, and Malte Selig
Author(s): Robert Salzwedel, Lara Greten, Stefan Schmidt, Stephen Hughes, Andreas Knorr, and Malte Selig

We present a self-consistent Maxwell-Bloch theory to analytically study the interaction between a nanostructure consisting of a metal nanoparticle and a monolayer of transition-metal dichalcogenide. For the combined system, we identify an effective eigenvalue equation that governs the center-of-mass…

[Phys. Rev. B 109, 035309] Published Tue Jan 30, 2024

Non-Boltzmann thermoelectric transport in minimally twisted bilayer graphene
Bhaskar Ghawri, Phanibhusan S. Mahapatra, Manjari Garg, Shinjan Mandal, Aditya Jayaraman, Kenji Watanabe, Takashi Taniguchi, Manish Jain, U. Chandni, and Arindam Ghosh
Author(s): Bhaskar Ghawri, Phanibhusan S. Mahapatra, Manjari Garg, Shinjan Mandal, Aditya Jayaraman, Kenji Watanabe, Takashi Taniguchi, Manish Jain, U. Chandni, and Arindam Ghosh

The electronic bands formed in moiré systems with twisted bilayer graphene (tBLG) have emerged as a tunable platform for studying many novel concepts of condensed matter physics due to new interaction and topological effects. In particular, the multitude of closely packed flat bands and a sequence o…

[Phys. Rev. B 109, 045436] Published Tue Jan 30, 2024

Signature of nodal topology in nonlinear quantum transport across junctions in Weyl and multi-Weyl semimetals
Suvendu Ghosh, Snehasish Nandy, Jian-Xin Zhu, and A. Taraphder
Author(s): Suvendu Ghosh, Snehasish Nandy, Jian-Xin Zhu, and A. Taraphder

We investigate quantum transport through a rectangular potential barrier in Weyl semimetals (WSMs) and multi-Weyl semimetals (MSMs), within the framework of Landauer-Büttiker formalism. Our study uncovers the role of nodal topology imprinted in the electric current and the shot noise. We find that, …

[Phys. Rev. B 109, 045437] Published Tue Jan 30, 2024

Charge density wave transition in the magnetic topological semimetal ${\mathrm{EuAl}}_{4}$
R. Yang, C.-C. Le, P. Zhu, Z.-W. Wang, T. Shang, Y.-M. Dai, J.-P. Hu, and M. Dressel
Author(s): R. Yang, C.-C. Le, P. Zhu, Z.-W. Wang, T. Shang, Y.-M. Dai, J.-P. Hu, and M. Dressel

In rare-earth intermetallic topological materials, carriers from topological bands mediate the magnetic interactions between local moments, giving rise to a plethora of exotic quantum phenomena. Recently, anomalous magnetic instability, helical spin orders, and skyrmions were found in topological se…

[Phys. Rev. B 109, L041113] Published Tue Jan 30, 2024

Emergence of composite many-body exciton states in ${\mathrm{WS}}_{2}$ and ${\mathrm{MoSe}}_{2}$ monolayers
J. Choi, J. Li, D. Van Tuan, H. Dery, and S. A. Crooker
Author(s): J. Choi, J. Li, D. Van Tuan, H. Dery, and S. A. Crooker

When electron-hole pairs (excitons) are photoexcited into semiconductors containing a Fermi sea of mobile charges, they can form bound states known variously as trions, tetrons, or exciton-polarons. Crucially, the interaction occurs with those mobile carriers possessing distinguishable quantum numbers (e.g., spin). In monolayer TMD semiconductors, the availability of both spin and valley quantum numbers allows excitons to interact, simultaneously, with more than one type of quantum-mechanically distinguishable carrier. This leads to new types of composite excitons (e.g., six-particle “hexcitons”), which appear as distinct resonances in optical spectra.

[Phys. Rev. B 109, L041304] Published Tue Jan 30, 2024

Found 3 papers in prl
Date of feed: Wed, 31 Jan 2024 04:17:08 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)

Fractal States of the Schwinger Model
Elena V. Petrova, Egor S. Tiunov, Mari Carmen Bañuls, and Aleksey K. Fedorov
Author(s): Elena V. Petrova, Egor S. Tiunov, Mari Carmen Bañuls, and Aleksey K. Fedorov

The lattice Schwinger model, the discrete version of QED in $1+1$ dimensions, is a well-studied test bench for lattice gauge theories. Here, we study the fractal properties of this model. We reveal the self-similarity of the ground state, which allows us to develop a recurrent procedure for finding …

[Phys. Rev. Lett. 132, 050401] Published Tue Jan 30, 2024

Two-Pole Nature of the $\mathrm{Λ}(1405)$ resonance from Lattice QCD
John Bulava, Bárbara Cid-Mora, Andrew D. Hanlon, Ben Hörz, Daniel Mohler, Colin Morningstar, Joseph Moscoso, Amy Nicholson, Fernando Romero-López, Sarah Skinner, and André Walker-Loud (Baryon Scattering (BaSc) Collaboration)
Author(s): John Bulava, Bárbara Cid-Mora, Andrew D. Hanlon, Ben Hörz, Daniel Mohler, Colin Morningstar, Joseph Moscoso, Amy Nicholson, Fernando Romero-López, Sarah Skinner, and André Walker-Loud (Baryon Scattering (BaSc) Collaboration)

The first lattice QCD computation of πΣK¯N scattering amplitudes supports the two-pole nature of the puzzling Λ(1405) resonance.

[Phys. Rev. Lett. 132, 051901] Published Tue Jan 30, 2024

Transport Study of Charge-Carrier Scattering in Monolayer ${\mathrm{WSe}}_{2}$
Andrew Y. Joe, Kateryna Pistunova, Kristen Kaasbjerg, Ke Wang, Bumho Kim, Daniel A. Rhodes, Takashi Taniguchi, Kenji Watanabe, James Hone, Tony Low, Luis A. Jauregui, and Philip Kim
Author(s): Andrew Y. Joe, Kateryna Pistunova, Kristen Kaasbjerg, Ke Wang, Bumho Kim, Daniel A. Rhodes, Takashi Taniguchi, Kenji Watanabe, James Hone, Tony Low, Luis A. Jauregui, and Philip Kim

Employing flux-grown single crystal ${\mathrm{WSe}}_{2}$, we report charge-carrier scattering behaviors measured in $h$-BN encapsulated monolayer field effect transistors. We observe a nonmonotonic change of transport mobility as a function of hole density in the degenerately doped sample, which can…

[Phys. Rev. Lett. 132, 056303] Published Tue Jan 30, 2024

Found 2 papers in pr_res
Date of feed: Wed, 31 Jan 2024 04:17:08 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)

Structural transformation of dusty plasma crystal in dc discharge plasma by changing confinement ring bias
S. Jaiswal, Connor Belt, Anton Kananovich, and E. M. Aguirre
Author(s): S. Jaiswal, Connor Belt, Anton Kananovich, and E. M. Aguirre

We report an experimental study of the structural transition of a stable complex plasma crystal to a solid-liquid phase coexistence by the controlled adjustment of the confinement potential, while keeping all other parameters constant. The experiments are carried out on a tabletop linear dusty plasm…

[Phys. Rev. Research 6, 013119] Published Tue Jan 30, 2024

Ultrafast shift current dynamics in ${\mathrm{WS}}_{2}$ monolayer
Fuxiang He, Daqiang Chen, Xinguo Ren, Sheng Meng, and Lixin He
Author(s): Fuxiang He, Daqiang Chen, Xinguo Ren, Sheng Meng, and Lixin He

The shift current effect, in materials lacking inversion symmetry, may potentially allow the performance of photovoltaics to surpass the Shockley-Queisser limit for traditional $p\text{−}n$ junction-based photovoltaics. Although the shift-current effect has been studied from first principles via sec…

[Phys. Rev. Research 6, 013123] Published Tue Jan 30, 2024

Found 3 papers in nano-lett
Date of feed: Tue, 30 Jan 2024 14:06:17 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] Room-Temperature Strong Coupling of Few-Exciton in a Monolayer WS2 with Plasmon and Dispersion Deviation
Jie Zhong, Jun-Yu Li, Jin Liu, Yifan Xiang, He Feng, Renming Liu, Wei Li, and Xue-Hua Wang

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c04158

[ASAP] Single-Molecule Time-Resolved Spectroscopy in a Tunable STM Nanocavity
Jiří Doležal, Amandeep Sagwal, Rodrigo Cezar de Campos Ferreira, and Martin Švec

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c04314

[ASAP] Ultralow Auger-Assisted Interlayer Exciton Annihilation in WS2/WSe2 Moiré Heterobilayers
Cheng-Syuan Cai, Wei-Yan Lai, Po-Hsuan Liu, Tzu-Chieh Chou, Ro-Ya Liu, Chih-Ming Lin, Shangjr Gwo, and Wei-Ting Hsu

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c04688