A5101797475- Topological Materials and Phenomena
- Advanced Condensed Matter Physics
- 2D Materials and Applications
- Electronic and Structural Properties of Oxides
- Quantum, superfluid, helium dynamics
- Physics of Superconductivity and Magnetism
- Graphene research and applications
- Iron-based superconductors research
- Cold Atom Physics and Bose-Einstein Condensates
- Chalcogenide Semiconductor Thin Films
- Advanced Photocatalysis Techniques
- Quantum and electron transport phenomena
- MXene and MAX Phase Materials
- Magnetic and transport properties of perovskites and related materials
- Liquid Crystal Research Advancements
- Advanced Optical Imaging Technologies
- Porphyrin Metabolism and Disorders
- Gas Sensing Nanomaterials and Sensors
- Perovskite Materials and Applications
- Multiferroics and related materials
- Porphyrin and Phthalocyanine Chemistry
- Diamond and Carbon-based Materials Research
- Advanced Thermoelectric Materials and Devices
- Frequency Control in Power Systems
- Chemical Reactions and Mechanisms
Beijing Institute of Technology
2018-2025
The University of Tokyo
2022
Institute of Theoretical Physics
2022
Chinese Academy of Sciences
2022
University of Hong Kong
2022
Institute for Solid State Physics and Optics
2022
Princeton University
2022
Beijing Institute of Optoelectronic Technology
2019-2022
State Council of the People's Republic of China
2020
Nanjing Normal University
2016
In transition metal compounds, due to the interplay of charge, spin, lattice and orbital degrees freedom, many intertwined orders exist with close energies. One commonly observed states is so-called nematic electron state, which breaks in-plane rotational symmetry. This state appears in cuprates, iron-based superconductor, etc. Nematicity may coexist, affect, cooperate or compete other orders. Here we show anisotropic electronic superconductivity a recently discovered kagome CsV$_3$Sb$_5$ by...
CsV${}_{3}$Sb${}_{5}$ has been recently discovered to be a kagome superconductor. Here, the authors use scanning tunneling microscopy study its charge order and superconductivity at atomic scale. Through mapping energy gap of order, identify chiral electronic nature. They also elucidate surface nature 1$\ifmmode\times\else\texttimes\fi{}$4 superlattice superconducting excitations.
Kagome metals $A{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$ ($A=\mathrm{K}$, Rb, and Cs) exhibit superconductivity at 0.9--2.5 K charge-density wave (CDW) 78--103 K. Key electronic states associated with the CDW remain elusive. Here, we investigate low-energy excitations of ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$ by angle-resolved photoemission spectroscopy. We found an energy gap 50--70 meV Dirac-crossing points linearly dispersive bands, pointing to importance spin-orbit coupling. also a signature...
The recently discovered kagome metals $A$V${}_{3}$Sb${}_{5}$ ($A$=K, Rb or Cs) have generated great interest as they exhibit an unconventional charge density wave (CDW), superconductivity, and nontrivial band topology. Here, the authors combine infrared spectroscopy first-principles calculations to shed light on origin of CDW. They find that below CDW transition optical conductivity component associated with saddle points is significantly suppressed, while arising from light-electron Dirac...
The discovery of charge density wave (CDW) order in the kagome-lattice superconductor $A$V${}_{3}$Sb${}_{5}$ is interesting because potential interplay between CDW and superconductivity. This paper demonstrates that associated with a sudden hardening longitudinal optical phonon mode at ordering vector, thus establishing vector dependent electron-phonon coupling must play an important role $A$V${}_{3}$Sb${}_{5}$.
The recently discovered coexistence of superconductivity and charge-density wave order in the kagome systems $A{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$ ($A=\mathrm{K}$, Rb, Cs) has stimulated enormous interest. It is predicted that a vanadium-based system may host flat band, nontrivial linear dispersive Dirac surface states, electronic correlation. Although much research been carried out, origin (CDW) order, relationship between CDW, whether anomalous Hall effect (AHE) arises primarily from...
Compounds with kagome lattice usually host many exotic quantum states, including the spin liquid, non-trivial topological Dirac bands and a strongly renormalized flat band, etc. Recently an interesting vanadium based family $A{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$ $(A=\mathrm{K},\mathrm{Rb},\text{or}\phantom{\rule{0.28em}{0ex}}\mathrm{Cs})$ was discovered, these materials exhibit multiple properties, unconventional saddle-point driving charge density wave (CDW) state, superconductivity,...
Dosing cesium atoms on the surface of CsV${}_{3}$Sb${}_{5}$ suppresses charge-density wave that typically coexists with its superconductivity, paving way to understanding interplay between these two phenomena.
Kagome metals AV_{3}Sb_{5} (A=K, Rb, and Cs) exhibit a characteristic superconducting ground state coexisting with charge density wave (CDW), whereas the mechanisms of superconductivity CDW have yet to be clarified. Here we report systematic angle-resolved photoemission spectroscopy (ARPES) study Cs(V_{1-x}Nb_{x})_{3}Sb_{5} as function Nb content x, where isovalent substitution causes an enhancement transition temperature (T_{c}) reduction (T_{CDW}). We found that shifts Sb-derived electron...
Kagome lattices offer a fertile ground to explore exotic quantum phenomena associated with electron correlation and band topology. The recent discovery of superconductivity coexisting charge-density wave (CDW) in the kagome metals KV3Sb5, RbV3Sb5, CsV3Sb5 suggests an intriguing entanglement electronic order superconductivity. However, microscopic origin CDW, key understanding superconducting mechanism its possible topological nature, remains elusive. Here, we report angle-resolved...
In Kagome metal CsV$_3$Sb$_5$, multiple intertwined orders are accompanied by both electronic and structural instabilities. These exotic have attracted much recent attention, but their origins remain elusive. The newly discovered CsTi$_3$Bi$_5$ is a Ti-based to parallel CsV$_3$Sb$_5$. Here, we report angle-resolved photoemission experiments first-principles calculations on pristine Cs-doped samples. Our results reveal that the van Hove singularity (vHS) in can be tuned large energy range...
Abstract Transition metal compounds with kagome structure have been found to exhibit a variety of exotic structural, electronic, and magnetic orders. These orders are competing energies very close each other, resulting in complex phase transitions. Some the phases easily observable, such as charge density wave (CDW) superconducting phase, while others more challenging identify characterize. Here we present magneto-transport evidence new below ~ 35 K topological CsV 3 Sb 5 (CVS) thin flakes...
Kagome superconductors AV
Metallic oxide TiO2 nanocone structures (TNCs) have attracted tremendous interest in recent years, owing to their intriguing physicochemical properties and potential applications water purification related fields. However, the controllable...
On the kagome lattice, electrons benefit from simultaneous presence of band topology, flat electronic bands, and van Hove singularities, forming competing or cooperating orders. Understanding interrelation between these distinct order parameters remains a significant challenge, leaving much associated physics unexplored. In superconductor KV3Sb5, which exhibits charge density wave (CDW) state below T = 78 K, we uncover an unpredicted field-induced phase transition 6 K. The observed is marked...
Chirality or handedness manifests in all fields of science, ranging from cell biology, molecular interaction, and catalysis to different branches physics. In condensed matter physics, chirality is intrinsic enigmatic quantum phases, such as chiral charge density waves superconductivity. Here, the underlying response subtle leads broken symmetries ground state. Detection key understand these states but they are extremely challenging expose leading debate controversy. using second-order...
In spite of the observation various exotic correlated physics in twisted graphene and transition metal dichalcogenides, it remains a great challenge to prepare bilayers puckered elemental layered crystals developing field twistronics. Here, we report first discovery success epitaxial growth 39°-twisted bilayer α-Sb. Molecular dynamics simulations verify that α-Sb is energetically stable, consistent with experiments. Scanning tunneling spectroscopy combination first-principles calculations...
We report the magnetization, electrical resistivity, specific heat measurements and band structure calculations of layered superconductor SnTaS$_2$. The experiments are performed on single crystals grown by chemical vapor transport method. resistivity magnetic susceptibility indicate that SnTaS$_2$ is a type-II with transition temperature $T_c = 3$ K. upper critical field ($H_{c2}$) shows large anisotropy for parallel to $ab$ plane ($H//ab$) $c$ axis ($H//c$), dependence $H_{c2}$ $H//ab$...
We have performed angle-resolved photoemission spectroscopy on EuIn2As2 which is predicted to be an axion insulator in the antiferromagnetic state. By utilizing soft-x-ray and vacuum-ultraviolet photons, we revealed a three-dimensional hole pocket centered at Gamma point of bulk Brillouin zone together with heavily hole-doped surface state paramagnetic phase. Upon entering phase, band structure exhibits marked reconstruction characterized by emergence "M"-shaped near Fermi level. The...