A5011827650- Iron-based superconductors research
- Physics of Superconductivity and Magnetism
- Rare-earth and actinide compounds
- Corporate Taxation and Avoidance
- Topological Materials and Phenomena
- Intellectual Capital and Performance Analysis
- Advanced Condensed Matter Physics
- Inorganic Chemistry and Materials
- Electronic and Structural Properties of Oxides
- Magnetic and transport properties of perovskites and related materials
- Superconductivity in MgB2 and Alloys
- 2D Materials and Applications
- Quantum and electron transport phenomena
- Organic and Molecular Conductors Research
- Surface and Thin Film Phenomena
- Crystal Structures and Properties
- Chalcogenide Semiconductor Thin Films
- Advanced Chemical Physics Studies
- Molecular Junctions and Nanostructures
- Surface Chemistry and Catalysis
- Semiconductor Quantum Structures and Devices
- Inorganic Fluorides and Related Compounds
- Machine Learning in Materials Science
- Atomic and Subatomic Physics Research
- Advanced Thermoelectric Materials and Devices
University of Science and Technology of China
2011-2025
Jinan University
2025
Hefei National Center for Physical Sciences at Nanoscale
2009-2024
Shanghai Institute of Microsystem and Information Technology
2024
Chongqing University
2024
National Synchrotron Radiation Laboratory
2024
Shanghai Advanced Research Institute
2024
Fudan University
2010-2021
State Key Laboratory of Surface Physics
2015-2021
Collaborative Innovation Center of Advanced Microstructures
2015-2021
We report systematic optical studies of WS2 and WSe2 monolayers multilayers. The efficiency second harmonic generation shows a dramatic even-odd oscillation with the number layers, consistent presence (absence) inversion symmetry in even-layer (odd-layer). Photoluminescence (PL) measurements show crossover from an indirect band gap semiconductor at multilayers to direct-gap one monolayers. A hot luminescence peak (B) is observed ~0.4 eV above prominent edge (A) all samples. magnitude A-B...
The Majorana fermion, which is its own anti-particle and obeys non-abelian statistics, plays a critical role in topological quantum computing. It can be realized as bound state at zero energy, called mode (MZM), the vortex core of superconductor, or ends nanowire when both superconductivity strong spin orbital coupling are present. A MZM detected zero-bias conductance peak (ZBCP) tunneling spectroscopy. However, practice, clean robust MZMs have not been vortices due to contamination from...
The superconductivity of a kagome superconductor CsV_{3}Sb_{5} is studied by scanning tunneling microscopy and spectroscopy at ultralow temperature with high resolution. Two kinds superconducting gaps multiple sets coherent peaks residual zero-energy density states (DOS) are observed on both half-Cs Sb surfaces, implying multiband superconductivity. In addition, in-gap can be induced magnetic impurities but not nonmagnetic impurities, suggesting sign-preserving or s-wave order parameter....
We report that sizable single crystals of ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$ have been grown with the self-flux method. Measurements and anisotropy intrinsic transport magnetic properties from high-quality crystal are first presented. The resistivity (${\ensuremath{\rho}}_{c}/{\ensuremath{\rho}}_{ab}$) is as large 150 independent temperature. In contrast to susceptibility behavior observed in polycrystalline samples, no Curie-Weiss observed, a linear-$T$ dependent occurs...
Sr2IrO4 was predicted to be a high temperature superconductor upon electron doping since it highly resembles the cuprates in crystal structure, electronic structure and magnetic coupling constants. Here we report scanning tunneling microscopy/spectroscopy (STM/STS) study of with surface by depositing potassium (K) atoms. At 0.5-0.7 monolayer (ML) K coverage, observed sharp, V-shaped gap about 95% loss density state (DOS) at EFand visible coherence peaks. The magnitude is 25-30 meV for...
We synthesized the samples Sr(1-x)Sm(x)FFeAs with a ZrCuSiAs-type structure. These were characterized by resistivity and susceptibility. It is found that substitution of rare earth metal for alkaline in this system suppresses anomaly induces superconductivity. Superconductivity at 56 K nominal composition Sr(0.5)Sm(0.5)FFeAs realized, indicating superconducting transition temperatures iron arsenide fluorides can reach as high oxypnictides same
The correlation and competition between antiferromagnetism superconductivity are one of the most fundamental issues in high temperature superconductors. Superconductivity cuprate superconductors arises from suppressing an antiferromagnetic (AFM) Mott insulator1 while iron-pnictide AFM semimetals can coexist with orders2,3,4,5,6,7,8,9. This difference raises many intriguing debates on relation two classes Recently, at 32 K has been reported iron-chalcogenide AxFe2−ySe2 (A = K, Rb Cs)10,11,12....
We measure the resistivity and magnetic susceptibility in temperature range from 5 K to 600 for single crystals $A$Fe$_{2-y}$Se$_2$ ($A$ = K$_{0.8}$, Rb$_{0.8}$, Cs$_{0.8}$, Tl$_{0.5}$K$_{0.3}$ Tl$_{0.4}$Rb$_{0.4}$). A sharp superconducting transition is observed low susceptibility, shows 100% Meissner volume fraction all crystals, while an antiferromagnetic at Neel ($T_N$) as high 500 540 depending on A. It indicates coexistence of superconductivity antiferromagnetism. increase arises...
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.
Abstract Exotic quantum states arise from the interplay of various degrees freedom such as charge, spin, orbital, and lattice. Recently, a short-ranged charge order (CO) was discovered deep inside antiferromagnetic phase Kagome magnet FeGe, exhibiting close relationships with magnetism. Despite extensive investigations, CO mechanism remains controversial, mainly because behavior hinders precise identification superstructure. Here, combining multiple experimental techniques, we report...
We systematically investigated the in-plane resistivity anisotropy of electron-underdoped EuFe(2-x)Co(x)As(2) and BaFe(2-x)Co(x)As(2) hole-underdoped Ba(1-x)K(x)Fe(2)As(2). Large was found in former samples, while tiny detected latter ones. When it is detected, starts above structural transition temperature increases smoothly through it. As lowered further, takes a dramatic enhancement magnetic temperature. that universally tied to presence T-linear behavior resistivity. Our results...
We successfully grew the high-quality single crystals of ${A}_{x}$Fe${}_{2}$Se${}_{2}$ ($A$ $=$ K and Cs) by self-flux method. Sharp superconducting transition was observed for both types crystals. The show onset temperatures (${T}_{\mathrm{c}}$) 31 30 Cs compounds, respectively, with nearly 100$%$ superconductive shielding fraction. quite high resistivity in normal state more than 160 1300 $\mathrm{m}\ensuremath{\Omega}$ cm maximum ${\mathrm{K}}_{x}$Fe${}_{2}$Se${}_{2}$...
We measured the resistivity and magnetic susceptibility to map out phase diagram of single crystalline NaFe$_{1-x}$Co$_x$As. Replacement Fe by Co suppresses both structural transition, while enhances superconducting transition temperature ($T_{\rm c}$) component fraction. Magnetic exhibits temperature-linear dependence in high temperatures up 500 K for all samples, but such behavior suddenly breaks down non-superconducting overdoped crystal, suggesting that superconductivity is closely...
A new investigation of the candidate topological superconductor Cu${}_{x}$Bi${}_{2}$Se${}_{3}$ reveals microscopic details its superconductivity under various magnetic fields, which is potentially useful insight for quantum computing.
Surface K–dosed (Li 0.8 Fe 0.2 OH)FeSe provides new clues to understand the mechanism of FeSe-based superconductors.
Kagome metals show rich competing quantum phases due to geometry frustration, flat bands, many-body effects, and nontrivial topology. Recently, a novel charge density wave (CDW) was discovered deep inside the antiferromagnetic phase of FeGe, attracting intense attention close relation with magnetism. Here, via scanning tunneling microscope (STM), we find 2 \ifmmode\times\else\texttimes\fi{} CDW in FeGe is very fragile can be readily disrupted into initial 1 phase; small \ensuremath{\surd}3...
Superconductivity emerges in both La$_3$Ni$_2$O$_7$ and La$_4$Ni$_3$O$_{10}$ under high pressure by suppressing their density-wave transitions, but critical temperature (Tc) differs significantly between these two compounds. To gain deeper insights into the distinct superconducting states, it is essential to unravel nature of states at ambient pressure, a topic that remains largely unexplored. Here, using scanning tunneling microscopy/spectroscopy (STM/STS), we report direct visualization an...
Abstract The complex symmetry breaking states in AV 3 Sb 5 family have attracted extreme research attention, but controversy still exists, especially the question of time reversal charge density wave (CDW). Most recently, a chiral CDW has been suggested Kagome magnet FeGe, related study is very rare. Here, we use scanning tunneling microscope to behavior both short- and long-ranged CDWs FeGe. Different from previous studies, our revealed an isotropic without obvious breaking, while local...
Recently, two-dimensional Nb$_2$C has garnered increasing attention due to its functional-group-dependent superconductivity, both experimentally and theoretically. In contrast the halogen chalcogen additives that have been main focus of previous studies, we study effect lithium adsorption, which can also be incorporated during synthesis Nb$_2$C. Our computational analysis reveals a metal-to-superconductor transition in monolayer with critical temperature ($T_{\mathrm{c}}$) 22.1 K strong...
Recent advancements have established self-intercalation as a powerful technique for manipulating quantum material properties, with precisely controllable intercalation concentrations. Given the inherently rich phase diagrams of transition metal dichalcogenides (TMDCs), studying self-intercalated TMDCs can offer promising candidates investigating interplay between various orderings. This work focuses on fully intercalated bilayer TaSe$_2$ (Ta$_3$Se$_4$), which has recently been fabricated...
Recently, two-dimensional ${\mathrm{Nb}}_{2}\mathrm{C}$ has garnered increasing attention, both experimentally and theoretically, due to its functional-group-dependent superconductivity. In contrast the halogen chalcogen additives that were main focus of previous studies, we study effect lithium adsorption, which can also be incorporated during synthesis ${\mathrm{Nb}}_{2}\mathrm{C}$. Our computational analysis reveals a metal-to-superconductor transition in monolayer with critical...