A5066373376- Quantum and electron transport phenomena
- Graphene research and applications
- Topological Materials and Phenomena
- 2D Materials and Applications
- Molecular Junctions and Nanostructures
- MXene and MAX Phase Materials
- Magnetic properties of thin films
- Advancements in Semiconductor Devices and Circuit Design
- Surface and Thin Film Phenomena
- Perovskite Materials and Applications
- Physics of Superconductivity and Magnetism
- Quantum Mechanics and Non-Hermitian Physics
- Advanced Memory and Neural Computing
- Advanced Condensed Matter Physics
- Quantum chaos and dynamical systems
- Boron and Carbon Nanomaterials Research
- Thermal properties of materials
- Quantum Mechanics and Applications
- Quantum many-body systems
- Semiconductor materials and interfaces
- Synthesis and Properties of Aromatic Compounds
- Magnetic and transport properties of perovskites and related materials
- Theoretical and Computational Physics
- Magnetism in coordination complexes
- ZnO doping and properties
Shenzhen University
2016-2025
Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area
2024
Southeast University
2022
Peng Cheng Laboratory
2019-2021
State Council of the People's Republic of China
2016
University of Hong Kong
2008-2015
Shenzhen Technology University
2015
Institute of Theoretical Physics
2013
Peking University
2013
Abstract As one of the rising 2D materials, niobium‐carbide (Nb 2 C, well‐known as a member MXene family) has attracted considerable attention owing to its unique physical and chemical properties. In this work, few‐layer Nb C nanosheets (NSs) with large (≈255 nm) small (≈48 lateral dimensions are obtained via combination selective etching liquid cascade centrifugation. Their relaxation time photophysics process systematically investigated by transient absorption spectroscopy, size effect is...
Very recently, two new two-dimensional (2D) layered semi-conducting materials MoSi2N4 and WSi2N4 were successfully synthesized in experiments, a large family of these 2D materials, namely MA2Z4, was also predicted theoretically (Science, 369, 670 (2020)). Motivated by this exciting family, work, we systematically investigate the mechanical, electronic optical properties monolayer bilayer MoSi2P4 MoSi2As4 using first-principles calculation method. Numerical results indicate that both MoSi2Z4...
The interplay between the spin-orbit interaction (SOI) and magnetism produces interesting phenomena in superconductors. When a two-dimensional (2D) system with strong SOI is coupled to an $s$-wave superconductor, in-plane magnetic field can drive into gapless superconducting state induce mirage gap at finite energies for Ising superconductor. In this Letter, we demonstrate that when superconductor proximitized altermagnet, intrinsic anisotropic spin splitting of altermagnet result pair gaps...
We report a first-principles investigation of spin-dependent transport properties in two different graphene-based molecular junctions. By applying temperatures between leads without bias voltage, currents are driven which depend on reference temperature $T$, gradient $\mathrm{\ensuremath{\Delta}}T$, and gate voltage ${V}_{g}$. Moreover, pure spin charge can be obtained by adjusting $T,\mathrm{\ensuremath{\Delta}}T$, ${V}_{g}$ for both The directions these junctions opposite, understood...
Lateral heterostructures have attracted a great deal of attention due to their advanced properties, which may open up unforeseen opportunities in materials science and device physics.
Waiting time is an important transport quantity that complementary to average current and its fluctuation. So far all the studies of waiting distribution (WTD) are limited steady-state (either dc or ac). The existing theory cannot deal with WTD in transient regime. In this regard, we develop a theoretical formalism based on Keldysh nonequilibrium Green's-function study WTD. This suitable for dc, ac, can be used first-principles calculation realistic systems. We apply quantum dot system...
We perform first-principles calculations on electronic structures of armchair MoS2 nanoribbons (AMoS2NRs) passivated by non-metal atoms. In contrast to bare AMoS2NR (AMoS2NR-bare) or purely hydrogen (H) edge-terminated (AMoS2NR-H), it is found that H and oxygen (O) hybrid (AMoS2NR-H-O) more stable. AMoS2NR-H-O exhibits a direct band gap about 1.43 eV, which larger than those pristine (about 0.61 eV) AMoS2NR-H 0.60 eV), even exceeds the bulk 0.86 close monolayer 1.67 eV). The remarkable...
Disorder scattering plays important roles in quantum transport as well various Hall effects, including the second-order nonlinear effect induced by Berry curvature dipole. Calculation of disorder-averaged properties usually requires substantial computational resources, especially for higher-order effects. Existing methods are either limited approximation conditions or constrained numerical stability, making it difficult to conveniently obtain average physical quantities over a wide range...
Quantum geometric tensor (QGT), which is usually obtained by evaluating the quantum distance between Bloch states parametrized momentum, plays a key role in exploring exotic responses of materials. Herein, we revisit concept QGT further taking into account spin degree freedom. Besides conventional relating to momentum translation, uncover new (termed Zeeman QGT) translation as well rotation, whose imaginary (real) part gives Berry curvature (quantum metric). Notably, show that these novel...
We study a class of non-Hermitian topological superconductors described by one-dimensional Aubry-Andr\'e Harper and mosaic quasiperiodic models with $p$-wave superconducting pairing, where the non-Hermiticity is introduced on-site complex potentials. generalize two invariants, one based on transfer matrix method other generalized Majorana polarization, to characterize phases verify existence zero modes in superconductors. By combing Lyapunov exponent, fractional dimension wave functions, we...
In time-reversal invariant systems, all charge Hall effects predicted so far are extrinsic due to the dependence on relaxation time. We explore intrinsic signatures by studying quantum noise spectrum of current in and discover thermal noises both linear nonlinear regimes. As band geometric characteristics, tensor Berry curvature play critical roles various effects; do their fluctuations. It is found that order electric field purely intrinsic, second-order has contributions. particular, part...
At the interface between two-dimensional materials with different topologies, topologically protected one-dimensional states (also named zero-line modes) arise. Here, we focus on quantum anomalous Hall-effect-based modes formed at regimes Chern numbers. We find that these are chiral and unilaterally conductive due to breaking of time-reversal invariance. For a beam splitter consisting two intersecting zero lines, chirality ensures current can only be injected from four terminals. Our...
Topological invariants play an important role in characterizing topological phases. However, the of Hermitian systems usually fail to characterize non-Hermitian due non-Hermiticity. In this work, we generalize Majorana polarization, which is initially defined describe superconductors, as a edge invariant superconductors. The definition generalized polarization depends upon two inequivalent particle-hole symmetries systems. spinless Kitaev chain model and superconductor on honeycomb lattice...
Non-Hermiticity from nonreciprocal hoppings has recently been shown to induce exotic non-Hermitian phenomena. Here, we study a class of quasicrystal superconductors described by one-dimensional Kitaev and dimerized chains with complex quasiperiodic potentials. We unveil that the potentials lead localization transition all states become localized, but hopping is favorable extension these states. also uncover existence correspondence between unconventional real-complex energy spectrum....
We numerically investigate the second-order nonlinear Hall transport properties of a four-terminal system with time-reversal symmetry and broken inversion symmetry. Within nonequilibrium Green's function formalism, conductances are derived, where internal Coulomb potential in response to external voltages is explicitly included guarantee gauge invariance. For single mirror ${\mathcal{M}}_{x}$, only observable $y$ direction contributed solely from effect. From point view, observed phenomena...
We numerically investigate the electronic transport properties of graphene nanoribbons and carbon nanotubes with inter-valley coupling, e.g., in superlattices. By taking superlattice as an example, we show that tailoring bulk results rich structural configurations nanotubes. After studying characteristics corresponding armchair zigzag nanoribbon geometries, find linear bands can lead to Klein tunnelling-like phenomenon, i.e., electrons propagate along tubes without backscattering even...
Abstract Monolayer <?CDATA ${\mathrm{MoS}}_2$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">M</mml:mi> mathvariant="normal">o</mml:mi> mathvariant="normal">S</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> </mml:math> is a typical valleytronic material with valley-spin locked valence bands. We numerically investigate the polarized current in monolayer via adiabatic electron pumping. By introducing an...
The third-order nonlinear Hall effect induced by the Berry-connection polarizability tensor has been observed in Weyl semimetals ${\mathrm{T}}_{d}\text{\ensuremath{-}}{\mathrm{MoTe}}_{2}$ as well ${\mathrm{T}}_{d}\text{\ensuremath{-}}{\mathrm{TaIrTe}}_{4}$. experiments were performed on bulk samples, and results interpreted with semiclassical Boltzmann approach. Beyond limit, we develop a quantum transport theory to investigate response of four-terminal setup time-reversal symmetry regime....
Among various chiral semiconductor materials, two-dimensional (2D)/three-dimensional (3D) composite perovskites (CPs) offer the benefits of strong interface asymmetry and energy transfer between 2D 3D phases, making CPs promising for spintronic devices. Therefore, understanding their properties will be greatly important expanding relevant applications. In this work, we synthesized one pair 2D/3D CP films. Their Rashba effect spin relaxation process have been investigated by...
We study the electronic waiting-time distributions (WTDs) in a noninteracting quantum-dot spin valve by varying polarization and noncollinear angle between magnetizations of leads using scattering matrix approach. Since involves two channels (spin up down) both incoming outgoing channels, we three different kinds WTDs, which are two-channel WTD, spin-resolved single-channel cross-channel WTD. analyze behaviors WTDs short times, correlated with current for polarizations angles. Cross-channel...