A5100353653- Topological Materials and Phenomena
- 2D Materials and Applications
- Graphene research and applications
- Perovskite Materials and Applications
- Quantum and electron transport phenomena
- Advanced Condensed Matter Physics
- MXene and MAX Phase Materials
- Thermal properties of materials
- Physics of Superconductivity and Magnetism
- Quantum, superfluid, helium dynamics
- Quantum Information and Cryptography
- Magnetic properties of thin films
- Advanced Thermoelectric Materials and Devices
- Sparse and Compressive Sensing Techniques
- Neural Networks and Applications
- Seismic Imaging and Inversion Techniques
- Microwave Imaging and Scattering Analysis
- Solid-state spectroscopy and crystallography
- Molecular Junctions and Nanostructures
- Advanced MRI Techniques and Applications
- Quantum Dots Synthesis And Properties
- Advanced Photocatalysis Techniques
- Cold Atom Physics and Bose-Einstein Condensates
- Electronic and Structural Properties of Oxides
- Multiferroics and related materials
University of Science and Technology of China
2015-2025
Nanjing Normal University
2018-2024
University of Cambridge
2024
University of Shanghai for Science and Technology
2022-2023
Shanghai Institute of Technical Physics
2022-2023
Singapore University of Technology and Design
2019-2023
Quantum Technologies (Sweden)
2023
LIT-PHONON (Russia)
2023
Chinese Academy of Sciences
2020-2023
Institute of Physics
2021-2023
With the further miniaturization and integration of multi-dimensional optical information detection devices, polarization-sensitive photodetectors based on anisotropic low-dimension materials have attractive potential applications. However, performance these devices is restricted by intrinsic property leading to a small polarization ratio detectors. Here, we construct black phosphorus (BP) homojunction photodetector defined ferroelectric domains with ultra-sensitive photoresponse. modulation...
Defect engineering can create various vacancy configurations in catalysts by finely tuning the local electronic and geometric structures of active sites. However, achieving precise control identification these defects remains a significant challenge, origin catalysts, especially clustered or associated ones, largely unknown. Herein, we successfully achieve controllable fabrication quantitative triple O-Ti-O associate (VOVTiVO) nanosized Ni-doped TiO2. Experimental theoretical analyses...
The reduced symmetry in strong spin-orbit coupling materials such as transition metal ditellurides (TMDTs) gives rise to non-trivial topology, unique spin texture, and large charge-to-spin conversion efficiencies. Bilayer TMDTs are non-centrosymmetric have topological properties compared monolayer or trilayer, but a controllable way prepare bilayer MoTe2 crystal has not been achieved date. Herein, we achieve the layer-by-layer growth of large-area trilayer 1T' single crystals...
Kagome lattices of various transition metals are versatile platforms for achieving anomalous Hall effects, unconventional charge-density wave orders and quantum spin liquid phenomena due to the strong correlations, spin-orbit coupling and/or magnetic interactions involved in such a lattice. Here, we use laser-based angle-resolved photoemission spectroscopy combination with density functional theory calculations investigate electronic structure newly discovered kagome superconductor CsTi3Bi5,...
Thermal annealing is essential for achieving ultrasmall size ferromagnetic properties in next-generation high performance nanocomposite magnetic materials. However, during the process, growth and agglomeration of nanoparticles normally occurs, which destroys narrow distributions. Thus, materials become less suitable application high-density recording. The mechanism nanoparticle sintering has been difficult to determine because lack situ tools probe subnanometer changes at local level. Here...
The mechanical properties of black phosphorus (BP) nanoribbons suspended on narrow grooves are quantitatively investigated with the nanoindentation method basis atomic force microscopy. elastic moduli BP strongly related to included angle between lattice orientation and groove. A theoretical model based classical elasticity theory is established explain directional modulus matches well experimental results. ideal zigzag armchair about 65 27 GPa, respectively, this agrees simulation results...
Atomic-scale defects in two-dimensional transition metal dichalcogenides (TMDs) often dominate their physical and chemical properties. Introducing a controllable manner can tailor properties of TMDs. For example, chalcogen atom TMDs were reported to trigger phase transition, induce ferromagnetism, drive superconductivity. However, strategies including postgrowth annealing, laser irradiation, or plasma usually require high temperature (such as 500 °C) cause unwanted structural damage. Here,...
There has been growing interest in investigating chiral phonons since they are theoretically found and experimentally verified recently. In a magnetic system with time inversion symmetry breaking, phonon can have nonzero angular momentum, which makes correction to the gyromagnetic ratio measured Einstein–de Haas effect. Though total momentum is zero nonmagnetic two-dimensional (2D) hexagonal space at high points of Brillouin zone means phonons. Chiral decide selection rules electronic...
Chiral phonons were initially proposed and experimentally verified in two-dimensional (2D) systems. Their intriguing effects have generated profound impacts on multiple research fields. However, all chiral reported to date are constrained be local, the sense that their group velocities vanish identically. Here, we propose concept of propagating 3D phonons, which can transport information chirality angular momentum. Guided by necessary conditions using first-principles calculations,...
The diode effect means that carriers can only flow in one direction but not the other. While effects for electron charge, spin, or photon have been widely discussed, it remains a question whether chiral phonon be realized, which utilizes degree of freedom lattice vibrations. In this work, we reveal an intrinsic connection between chiralities crystal structure and its excitations, naturally leads to crystals. At certain frequency, phonons with definite chirality propagate opposite. We...
Topological phonons in crystalline materials have been attracting great interest. However, most cases studied so far are direct generalizations of the topological states from electronic systems. Here, we reveal a novel class -- symmetry-enforced nodal-chain phonons, which manifest features unique for phononic We show that with $D_{2d}$ little co-group at non-time-reversal-invariant-momentum point, nodal chain is guaranteed to exist owing vector basis symmetry character distinct and other...
In a semiclassical model, magnetic fields can originate from the orbital moments of electrons. Here, using Biot-Savart law, we theoretically predict effective induced by chiral phonons in point-charge model. Taking tellurium as an example, it is found that applying temperature gradient, average field per mode for specific location within unit cell reach order 0.01 T at room temperature. We prove has ability to manipulate Curie and spontaneous magnetization ferromagnetic material or even...
Chiral phonons have been theoretically proposed [Zhang and Niu, Phys. Rev. Lett. 115, 115502 (2015)] experimentally verified [Zhu et al., Science 359, 579 (2018)] in materials with hexagonal lattice. Here, we predict investigate the chiral kagome We show that broken inversion symmetry, large circular polarization can emerge at $K$ ${K}^{\ensuremath{'}}$ high symmetry points. Different from lattice, these all three sublattices vibrating same chirality, vibration orbit take an elliptical...
The semiconductor MoS2 has attracted much attention owing to its sizable energy bandgap, significant spin–orbit coupling, and quantum effects such as the valley Hall effect gate-induced superconductivity. However, in electronic devices, bandgap usually gives rise formation of Schottky barriers at interface contact metal, which may render devices intended for transport inapplicable low temperature. Therefore, fabrication Ohmic contacts operational temperature is crucial. Yet, it currently...
Coherent phonons can give rise to phenomena and physical mechanisms in different systems. Understanding phonon-boundary scattering is critical for the manipulation of thermal properties. In this paper, it found that conductivity rough graphene nanoribbon first monotonically changes, then exhibits an oscillatory manner with varying surface boundary roughness. An obvious increase conductivity, up 25.33%, be observed as roughness increases from 0.61 0.72. This contrast conventional...
Chiral phonons were initially proposed and further verified experimentally in two-dimensional (2D) hexagonal crystal lattices. Many intriguing features brought about by chiral are attributed to the pseudoangular momenta which associated with threefold rotational symmetry of Here, we go beyond crystals investigate systems fourfold symmetry. We clarify requirements for emergence both 2D square lattices three-dimensional tetragonal For two dimensions, realization ${C}_{4}$ requires breaking...
As an ideal platform, both the theoretical prediction and first experimental verification of chiral phonons are based on transition-metal dichalcogenide materials. The manipulation phonon chirality in these materials will have a profound effect study phonons. In this work, we utilize sliding ferroelectric to realize mechanism Based first-principles calculations, find different effects interlayer Berry curvature bilayer four-layer MoS2 ferroelectrics. These further affect angular momentum...
The theoretical finding on chiral phonons at Brillouin-zone corners (valleys) of two-dimensional honeycomb lattices and its experimental verification in monolayer tungsten diselenide [H. Zhu, J. Yi, M. Li, Xiao, L. Zhang, C. Yang, R. A. Kaindl, Y. Wang, X. Science 359, 579 (2018)], have attracted wide attention the study phonon chirality very recently. In this paper, to make more measurable, valley were folded center $\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}$ superlattices, near...
The burgeoning field of twistronics, which concerns how changing the relative twist angles between two materials creates new optoelectronic properties, offers a novel platform for studying twist-angle dependent excitonic physics. Herein, by surveying range hexagonal phase transition metal dichalcogenides (TMD) twisted homobilayers, we find that 21.8 ± 1.0°-twisted (7a×7a) and 27.8 (13a×13a) bilayers account nearly 20% total population in solution-phase restacked can be found also chemical...