A5062018362- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Iron-based superconductors research
- Inorganic Chemistry and Materials
- Crystal Structures and Properties
- Topological Materials and Phenomena
- Magnetic and transport properties of perovskites and related materials
- Magnetic properties of thin films
- Inorganic Fluorides and Related Compounds
- Rare-earth and actinide compounds
- Multiferroics and related materials
- 2D Materials and Applications
- Astrophysics and Cosmic Phenomena
- Electromagnetic wave absorption materials
- Advanced Antenna and Metasurface Technologies
- Surface and Thin Film Phenomena
- Dark Matter and Cosmic Phenomena
- Electronic and Structural Properties of Oxides
- Iron oxide chemistry and applications
- Mesoporous Materials and Catalysis
- Neutrino Physics Research
- Nuclear Physics and Applications
- Metalloenzymes and iron-sulfur proteins
- Ammonia Synthesis and Nitrogen Reduction
- Gestational Trophoblastic Disease Studies
China People's Public Security University
2025
Yale University
2021-2025
Jimei University
2025
Guilin University of Electronic Technology
2018-2025
Southeast University
2025
University of California, Berkeley
1998-2024
Lawrence Berkeley National Laboratory
1992-2024
Space Engineering University
2024
China Medical University
2024
Shanghai University
2021-2024
The physics of quantum materials is dictated by many-body interactions and mathematical concepts such as symmetry topology that have transformed our understanding matter. Angle-resolved photoemission spectroscopy (ARPES), which directly probes the electronic structure in momentum space, has played a central role discovery, characterization, ranging from strongly-correlated states matter to those exhibiting non-trivial topology. Over past two decades, ARPES technique matured dramatically with...
The in-plane resistivity $\ensuremath{\rho}$ and thermal conductivity $\ensuremath{\kappa}$ of the FeAs-based superconductor ${\mathrm{KFe}}_{2}{\mathrm{As}}_{2}$ single crystal were measured down to 50 mK. We observe non-Fermi-liquid behavior $\ensuremath{\rho}(T)\ensuremath{\sim}{T}^{1.5}$ at ${H}_{{c}_{2}}=5\text{ }\text{ }\mathrm{T}$, development a Fermi liquid state with $\ensuremath{\rho}(T)\ensuremath{\sim}{T}^{2}$ when further increasing field. This suggests field-induced quantum...
Conspiring interactions in a cuprate More than 30 years after the discovery of high-temperature superconductivity copper oxides, its mechanism remains mystery. Electron pairing mediated solely by lattice vibrations—phonons—is thought to be insufficient account for high transition temperatures. He et al. found rapid and correlated increase superconducting gap electron-phonon as chemical composition their bismuth-based samples was varied across critical doping concentration. The interplay with...
A sharp boundary in the cuprates Many physicists working on cuprate superconductors believe that so-called strange metal phase diagram is associated with a quantum critical point. Within this picture, point gives rise to V-shaped region doping-temperature of cuprates: phase. Chen et al. used angle-resolved photoemission spectroscopy family Bi2212 challenge view. By taking comprehensive measurements as function doping and temperature—and making sure signal was not affected by environmental...
Experiments reveal changes in the electronic state of iron-based superconductor FeSe during emergence nematicity, a fourfold rotational symmetry breaking that arises close to onset superconductivity.
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...
Topological superconductors (TSCs) are unconventional with bulk superconducting gap and in-gap Majorana states on the boundary that may be used as topological qubits for quantum computation. Despite their importance in both fundamental research applications, natural TSCs very rare. Here, combining state of art synchrotron laser-based angle-resolved photoemission spectroscopy, we investigated a stoichiometric transition metal dichalcogenide (TMD), 2M-WS2 temperature 8.8 K (the highest among...
The existence of long-range magnetic order in low-dimensional systems, such as the quasi-two-dimensional van der Waals (vdW) magnets, has attracted intensive studies new physical phenomena. vdW Fe_{N}GeTe_{2} (N=3, 4, 5; FGT) family is exceptional, owing to its vast tunability properties. In particular, a ferromagnetic ordering temperature (T_{C}) above room at N=5 (F5GT) observed. Here, our study shows that, by nickel (Ni) substitution iron F5GT, record high T_{C}=478(6) K achieved....
The development of scanning probe microscopy (SPM) has enabled unprecedented scientific discoveries through high-resolution imaging. Simulations and theoretical analysis SPM images are equally important as obtaining experimental since their comparisons provide fruitful understandings the structures physical properties investigated systems. So far, image simulations conventionally based on quantum mechanical theories, which can take several days in tasks large-scale Here, we have developed a...
Acute kidney injury (AKI) is a serious clinical syndrome with high morbidity, elevated mortality, and poor prognosis, commonly considered "sword of Damocles" for hospitalized patients, especially those in intensive care units. Oxidative stress, inflammation, apoptosis, caused by the excessive production reactive oxygen species (ROS), play key role AKI progression. Hence, investigation effective safe antioxidants inflammatory regulators to scavenge overexpressed ROS regulate inflammation has...
We developed a table-top vacuum ultraviolet (VUV) laser with $113.778$nm wavelength (10.897eV) and demonstrated its viability as photon source for high resolution angle-resolved photoemission spectroscopy (ARPES). This sub-nanosecond pulsed VUV operates at repetition rate of 10MHz, provides flux 2$\times$10$^{12}$ photons/second, enables energy momentum resolutions better than 2meV 0.012\AA$^{-1}$, respectively. Space-charge induced shifts spectral broadenings can be reduced below 2meV. The...
We study optimally doped Bi-2212 (T(c)=96 K) using femtosecond time- and angle-resolved photoelectron spectroscopy. Energy-resolved population lifetimes are extracted compared with single-particle measured by equilibrium photoemission. The deviate from the in low excitation limit 1-2 orders of magnitude. Fundamental considerations electron scattering unveil that these two general distinct, yet for systems only electron-phonon they should converge low-temperature, low-fluence limit....
Significance Fermi surface (FS) topology is a fundamental property of metals and superconductors. In electron-doped cuprate Nd 2− x Ce CuO 4 , an unexpected FS reconstruction has been observed in optimal- overdoped regime ( = 0.15 − 0.17) by quantum oscillation measurements (QOM). This puzzling because neutron scattering suggests that the antiferromagnetic long-range order, which believed to reconstruct FS, vanishes before 0.14. Here, we report angle-resolved photoemission evidence...
The effect of Lifshitz transition on thermodynamics and superconductivity in hole-doped cuprates has been heavily debated but remains an open question. In particular, observed peak electronic specific heat is proposed to originate from fluctuations a putative quantum critical point p* (e.g., the termination pseudogap at zero temperature), which close distinguishable overdoped La-based where Fermi surface transforms hole-like electron-like. Here we report situ angle-resolved photoemission...
BaNi$_2$As$_2$ is a nonmagnetic analogue of the iron pnictide superconductors, and in its tetragonal state exhibits an incommensurate charge-density-wave (IC-CDW) sizable elastoresistance. In this work, phonons associated with IC-CDW uniform in-plane lattice distortions are investigated using high-resolution inelastic X-ray scattering. The transverse acoustic reveal no softening at temperatures where elastoresistance increases strongly, indicating latter to be electronically driven....
Electron-hole bound pairs, or excitons, are common excitations in semiconductors. They can spontaneously form and condense into a new insulating ground state---the so-called excitonic insulator---when the energy of electron-hole Coulomb attraction exceeds band gap. In presence electron-phonon coupling, periodic lattice distortion often concomitantly occurs. However, similar structural transition also be induced by coupling itself, therefore hindering clean identification bulk insulators...
Abstract We examine key aspects of the theory Bardeen–Cooper–Schrieffer (BCS) to Bose–Einstein condensation (BEC) crossover, focusing on temperature dependence chemical potential, μ . identify an accurate method determining change in cuprate high superconductors from angle-resolved-photoemission data (along ‘nodal’ direction), and show that varies by less than a few percent Fermi energy over range temperatures far below several times above superconducting transition temperature, T c This...