A5012883313- Iron-based superconductors research
- Topological Materials and Phenomena
- 2D Materials and Applications
- Graphene research and applications
- Rare-earth and actinide compounds
- Electronic and Structural Properties of Oxides
- Physics of Superconductivity and Magnetism
- Corporate Taxation and Avoidance
- Advanced Condensed Matter Physics
- Ferroelectric and Piezoelectric Materials
- Chalcogenide Semiconductor Thin Films
- Magnetic and transport properties of perovskites and related materials
- Advanced Thermoelectric Materials and Devices
- Electrocatalysts for Energy Conversion
- Neurogenesis and neuroplasticity mechanisms
- Inorganic Chemistry and Materials
- Fuel Cells and Related Materials
- Diamond and Carbon-based Materials Research
- Microwave Dielectric Ceramics Synthesis
- Perovskite Materials and Applications
- Semiconductor materials and devices
- Advancements in Solid Oxide Fuel Cells
- Neuroinflammation and Neurodegeneration Mechanisms
- Heusler alloys: electronic and magnetic properties
- Regulation of Appetite and Obesity
Fudan University
2011-2025
Shanghai Institute of Pharmaceutical Industry
2023-2025
University of Science and Technology of China
2023-2025
Central South University
2019-2024
Argonne National Laboratory
2024
Shanghai Institute of Microsystem and Information Technology
2024
Shanghai Advanced Research Institute
2024
Chongqing University
2024
National Synchrotron Radiation Laboratory
2024
Hubei University
2006-2023
Abstract Topological Weyl semimetal (TWS), a new state of quantum matter, has sparked enormous research interest recently. Possessing unique fermions in the bulk and Fermi arcs on surface, TWSs offer rare platform for realizing many exotic physical phenomena. can be classified into type-I that respect Lorentz symmetry type-II do not. Here, we directly visualize electronic structure MoTe 2 , recently proposed TWS. Using angle-resolved photoemission spectroscopy (ARPES), unravel surface arcs,...
Kondo insulators (KIs) are strongly correlated materials in which the interactions between 4f and conduction electrons lead to a hybridization gap opening at low temperature 1-2. SmB6 is typical KI, but its resistivity does not diverge temperatures, was attributed some in-gap states 3-10. However after several decades of research, nature origin remain unclear. Recent band calculation transport measurements suggest that could actually be ascribed topological surface states. thus might first...
We report the detailed electronic structure of WTe$_2$ by high resolution angle-resolved photoemission spectroscopy. Unlike simple one electron plus hole pocket type Fermi surface topology reported before, we resolved a rather complicated WTe$_2$. Specifically, there are totally nine pockets, including at Brillouin zone center $\Gamma$, and two pockets on each side $\Gamma$ along $\Gamma$-$X$ direction. Remarkably, have observed circular dichroism in our spectra, which suggests that orbital...
A new layered oxide semiconductor (Bi 2 O Se) is found with excellent electronic properties for promising applications.
Here we report the evidence of type II Dirac Fermion in layered crystal PdTe2. The de Haas-van Alphen oscillations find a small Fermi pocket with cross section 0.077nm-2 nontrivial Berry phase. First-principal calculations reveal that it is originated from hole tilted cone. Angle Resolved Photoemission Spectroscopy demonstrates cone featured dispersion. We also suggest PdTe2 an improved platform to host topological superconductors.
Weyl semimetals exhibit exceptional quantum electronic transport due to the presence of topologically-protected band crossings called nodes. The nodes come in pairs with opposite chirality, but their number and location momentum space is otherwise material specific. Following initial discoveries there now a need for better realizations, ideally comprising single pair located at or very close Fermi level an energy window free from other overlapping bands. Here we propose layered intermetallic...
Topological Dirac semimetals (TDSs) represent a new state of quantum matter recently discovered that offers platform for realizing many exotic physical phenomena. A TDS is characterized by the linear touching bulk (conduction and valance) bands at discrete points in momentum space (i.e. 3D points), such as Na3Bi Cd3As2. More recently, types with robust line-nodes (with non-trivial topology or near critical point between topological phase transitions) have been proposed extends from to 1D...
While the parent compounds of cuprate high temperature superconductors (high-Tc's) are Mott insulators, iron-pnictide high-Tc's in vicinity a metallic spin density wave (SDW) state, which highlights difference between these two families. However, insulating were identified for newly discovered KxFe2-ySe2. This raises an intriguing question as to whether iron-based could be viewed doped insulators like cuprates. Here we report angle-resolved photoemission spectroscopy (ARPES) evidence and one...
The superconductivity discovered in iron pnictides is intimately related to a nematic ground state, where the ${C}_{4}$ rotational symmetry broken via structural and magnetic transitions. We here study nematicity NaFeAs with polarization-dependent angle-resolved photoemission spectroscopy. A uniaxial pressure was applied on sample overcome twinning effect low temperature ${C}_{2}$-symmetric state obtain much simpler electronic structure than that of twinned sample. found undergoes an...
Topological quantum materials represent a new class of matter with both exotic physical phenomena and novel application potentials. Many Heusler compounds, which exhibit rich emergent properties such as unusual magnetism, superconductivity heavy fermion behaviour, have been predicted to host non-trivial topological electronic structures. The coexistence order other makes ideal platform search for phases (such anomalous Hall insulator superconductor). By carrying out angle-resolved...
ZrSiS materials show unsaturated magnetoresistance until a magnetic field of 53 T with butterfly-shaped angular dependence. Intense Shubnikov-de Haas oscillations resolve bulk Dirac cone nontrivial Berry phase. Combined angle-resolved photoemission spectroscopy and theoretical calculations, is proved to be material both surface bands. As service our authors readers, this journal provides supporting information supplied by the authors. Such are peer reviewed may re-organized for online...
We present the electronic characterization of single-layer 1H-TaSe2 grown by molecular beam epitaxy using a combined angle-resolved photoemission spectroscopy, scanning tunneling microscopy/spectroscopy, and density functional theory calculations. demonstrate that 3 × charge-density-wave (CDW) order persists despite distinct changes in low energy structure highlighted reduction number bands crossing Fermi corresponding modification surface topology. Enhanced spin–orbit coupling lattice...
To understand the pairing symmetry and superconducting transition temperature in heavily electron-doped iron-based superconductors, it is important to study more of these materials, especially ones with decent stability air without phase separation. Here, angle-resolved photoemission spectroscopy probes surface electronic structure gap new superconductor (Li${}_{0.8}$Fe${}_{0.2}$)OHFeSe, which shows a ${T}_{c}$ as high 40 K.
An extreme magnetoresistance (XMR) has recently been observed in several nonmagnetic semimetals. Increasing experimental and theoretical evidence indicates that the XMR can be driven by either topological protection or electron-hole compensation. Here, investigating electronic structure of a material, YSb, we present spectroscopic for special case which lacks perfect Further investigations reveal cooperative action substantial difference between electron hole mobility moderate carrier...
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...
Coagulase-negative Staphylococcus epidermidis has become the leading cause of foreign-body infections due to its biofilm formation on all kinds medical-device surfaces. The development S. includes two steps: initial attachment phase and accumulative phase. In phase, polysaccharide intercellular adhesin (PIA), encoded by icaADBC locus, is major component mediating adhesion. However, recent studies have revealed emergence biofilm-positive/ ica -negative staphylococcal clinical isolates. this...
The diversities in crystal structures and ways of doping result extremely diversified phase diagrams for iron-based superconductors. With angle-resolved photoemission spectroscopy, we have systematically studied the effects chemical substitution on electronic structure various series Beyond Fermi-surface alteration that has been reported most often past, found two more extraordinary doping: (1) site band dependencies quasiparticle scattering and, importantly, (2) ubiquitous significant...
Although a nodeless superconducting gap has been observed on the large Fermi pockets around zone corner in K${}_{x}$Fe${}_{2\ensuremath{-}y}$Se${}_{2}$, whether its pairing symmetry is $s$ wave or $d$ still under intense debate. Here we report an isotropic distribution small electron pocket $Z$ point which favors $s$-wave symmetry.
FeSe exhibits a novel ground state in which superconductivity coexists with nematic order the absence of any long-range magnetic order. Here, we report on an angle-resolved photoemission study superconducting gap structure FeSe_{0.93}S_{0.07}, without complications caused by Fermi surface reconstruction induced We find that shows pronounced twofold anisotropy around elliptical hole pocket near Z (0, 0, π), minima at end points its major axis, while no detectable is observed Γ 0) and zone...
Topological nodal semimetal (TNS), characterized by its touching conduction and valence bands, is a newly discovered state of quantum matter which exhibits various exotic physical phenomena. Recently, new type TNS called topological line (TNLS) predicted where band form degenerate one-dimension further protected crystal symmetry. In this work, we systematically investigated the bulk surface electronic structure non-symmorphic, TNLS in InBi (which also II Dirac semimetal) with strong...