A5101408666- Topological Materials and Phenomena
- 2D Materials and Applications
- Advanced Condensed Matter Physics
- Graphene research and applications
- Physics of Superconductivity and Magnetism
- Quantum many-body systems
- GaN-based semiconductor devices and materials
- Advanced Thermoelectric Materials and Devices
- Electronic and Structural Properties of Oxides
- Organic and Molecular Conductors Research
- Theoretical and Computational Physics
- MXene and MAX Phase Materials
- Semiconductor Quantum Structures and Devices
- Superconductivity in MgB2 and Alloys
- Multiferroics and related materials
- Ga2O3 and related materials
- Bone health and osteoporosis research
- Photocathodes and Microchannel Plates
- Metal and Thin Film Mechanics
- Cognitive Abilities and Testing
- Magnetic and transport properties of perovskites and related materials
- Quantum and electron transport phenomena
- Perovskite Materials and Applications
- Photonic and Optical Devices
- Boron and Carbon Nanomaterials Research
Shanghai Jiao Tong University
2007-2025
China Medical University
2025
Kavli Institute for Theoretical Sciences
2022-2024
University of Chinese Academy of Sciences
2022-2024
Tianjin Medical University
2024
Tianjin University
2024
Songshan Lake Materials Laboratory
2023
Park University
2022
Renmin University of China
2020-2021
University of Illinois Urbana-Champaign
2016-2020
Single layers of transition metal dichalcogenides (TMDCs) are excellent candidates for electronic applications beyond the graphene platform; many them exhibit novel properties including charge density waves (CDWs) and magnetic ordering. CDWs in these single generally a planar projection corresponding bulk because quasi-two-dimensional nature TMDCs; different CDW symmetry is unexpected. We report herein successful creation pristine single-layer ${\mathrm{VSe}}_{2}$, which shows...
Two-dimensional (2D) topological insulators (TIs) are promising platforms for low-dissipation spintronic devices based on the quantum spin Hall (QSH) effect, but experimental realization of such systems with a large band gap suitable room-temperature applications has proven difficult. Here, we report successful growth bilayer graphene quasi-freestanding WSe$_2$ single layer 1T' structure that does not exist in bulk form WSe$_2$. Using angle-resolved photoemission spectroscopy (ARPES) and...
Three-dimensional (3D) topological Dirac semimetals (TDSs) are rare but important as a versatile platform for exploring exotic electronic properties and phase transitions. A quintessential feature of TDSs is 3D fermions associated with bulk states near the Fermi level. Using angle-resolved photoemission spectroscopy, we have observed such cones in epitaxially grown α-Sn films on InSb(111), first TDS system realized an elemental form. First-principles calculations confirm that epitaxial...
Stanene (single-layer grey tin), with an electronic structure akin to that of graphene but exhibiting a much larger spin-orbit gap, offers promising platform for room-temperature electronics based on the quantum spin Hall (QSH) effect. This material has received theoretical attention, suitable substrate stanene growth results in overall gapped been elusive; sizable gap is necessary applications. Here, we report study epitaxially grown (111)B-face indium antimonide (InSb). Angle-resolved...
Electrons and holes can spontaneously form excitons condense in a semimetal or semiconductor, as predicted decades ago. This type of Bose condensation happen at much higher temperatures comparison with dilute atomic gases. Two-dimensional (2D) materials reduced Coulomb screening around the Fermi level are promising for realizing such system. Here we report change band structure accompanied by phase transition about 180 K single-layer ZrTe2 based on angle-resolved photoemission spectroscopy...
Charge density wave (CDW) formation in solids is a critical phenomenon involving the collective reorganization of electrons and atoms system into structure, it expected to be sensitive geometric constraint at nanoscale. Here, we study CDW transition TiSe2, quasi-two-dimensional layered material, determine effects quantum confinement changing dimensions films ranging from single layer multilayers. Of key interest characteristic length scale for transformation two-dimensional case...
Two-dimensional materials constitute a promising platform for developing nanoscale devices and systems. Their physical properties can be very different from those of the corresponding three-dimensional because extreme quantum confinement dimensional reduction. Here we report study TiTe2 single-layer to bulk limit. Using angle-resolved photoemission spectroscopy scanning tunneling microscopy spectroscopy, observed emergence (2 × 2) charge density wave order in with transition temperature 92 ±...
Platinum ditelluride (PtTe_{2}), a type-II Dirac semimetal, remains semimetallic in ultrathin films down to just two triatomic layers (TLs) with negative gap of -0.36 eV. Further reduction the film thickness single TL induces Lifshitz electronic transition semiconductor large positive +0.79 This is evidenced by experimental band structure mapping prepared layer-resolved molecular beam epitaxy, and comparing data first-principles calculations using hybrid functional. The results demonstrate...
Mott insulators with localized magnetic moments will exhibit a quantum spin liquid state when the fluctuations are strong enough to suppress ordering of spins. Such an entangled give rise collective excitations, in which and charge information carried separately. Our angle-resolved photoemission spectroscopy measurements on single-layer 1T-TaS_{2} show flat band around zone center gap opening about 200 meV low temperature, indicating 2D insulating nature system. This is dispersionless...
Abstract Charge density wave (CDW) formation, a key physics issue for materials, arises from interactions among electrons and phonons that can also lead to superconductivity other competing or entangled phases. The prototypical system TiSe 2 , with particularly simple (2 × 2) transition no Kohn anomalies caused by electron-phonon coupling, is fascinating but unsolved case after decades of research. Our angle-resolved photoemission measurements the band structure as function temperature,...
Elastic strain has the potential for a controlled manipulation of band gap and spin-polarized Dirac states topological materials, which can lead to pseudo-magnetic-field effects, helical flat bands phase transitions. However, practical realization these exotic phenomena is challenging yet be achieved. Here, we show that surface insulator Bi2Se3 reversibly tuned by an externally applied elastic strain. Performing in-situ x-ray diffraction angle-resolved photoemission spectroscopy measurements...
Abstract Background The prevalence of dementia among people aged 60 years and older is 7.54%, the mild cognitive impairment 17.99% in Taiwan [1]. Both genetic risk lifestyle play a pivotal role function [2,3]. However, most previous studies focused on Western populations. There have been neither large-scale nor genome-wide profiling such as polygenic scores (PRS) Asian It still unclear whether effect healthy lifestyles cognition varies by risk. Aims & Objectives This study aimed to...
Abstract Strong electron-electron interaction can induce Mott insulating state, which is believed to host unusual correlated phenomena such as quantum spin liquid when fluctuation dominates and unconventional superconductivity through doping. Transition metal compounds materials provide a versatile platform engineer the state. Previous studies mostly focused on controlling of repulsive bandwidth electrons by gating or Here, we performed angle-resolved photoemission spectroscopy (ARPES)...
Collective phenomena in solids can be sensitive to the dimensionality of system; a case special interest is VSe2, which shows (r7 x r3) charge density wave (CDW) single layer with three-fold symmetry normal phase spontaneously broken, contrast (4 4) in-plane CDW bulk. Angle-resolved photoemission spectroscopy (ARPES) from VSe2 ranging bulk reveals evolution electronic structure including Fermi surface contours and gap. At thickness two layers, ARPES maps are already nearly bulklike, but...
III-nitride light-emitting diodes (LEDs) grown on Si (111) substrates have the potential of low-cost manufacturing for solid-state lighting and display, by taking advantage well-developed IC technologies silicon. In this letter, LEDs silicon were transferred onto copper substrates, to maximize light extraction heat dissipation. On 300 × ¿m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> multiple quantum well InGaN first processed. The...
The quadrupole insulator, a higher-order topological with on-site Hubbard interaction is numerically studied by large-scale projector quantum Monte Carlo simulations. Green's function formalism successfully used to characterize properties in interacting insulators. We find that the insulator stable against weak interactions and turns into trivial antiferromagnetic continuous phase transition (TPT) for strong interactions. critical exponents related TPT are estimated be...
Interfacing bulk conducting topological Bi$_2$Se$_3$ films with s-wave superconductors initiates strong superconducting order in the nontrivial surface states. However, insulating (Bi$_{1-x}$Sb$_{x})_2$Te$_3$ on Nb instead exhibit a giant attenuation of superconductivity, even for only two-layers thick. This massive suppression proximity pairing is evidenced by ultrahigh-resolution band mappings and contrasting quantified gaps those heavily n-doped Bi$_2$Se$_3$/Nb. The results underscore...
We bring together ac susceptibility and dc magnetization to uncover the rich magnetic field-temperature behavior of a series rare earth indium oxides, RInO3 (R = Tb, Dy, Gd). The degree frustration is much larger than expected, particularly in TbInO3, ground states are glasslike with antiferromagnetic tendencies. activation energy for spin reorientation low. Chemical substitution Mn3+ ions form TbIn1–xMnxO3 (x ≤ 0.01) relieves that characterizes parent compound slightly enhances short-range...