A5001792482- Perovskite Materials and Applications
- Iron-based superconductors research
- 2D Materials and Applications
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- Solid-state spectroscopy and crystallography
- Advanced Condensed Matter Physics
- Electronic and Structural Properties of Oxides
- Gas Sensing Nanomaterials and Sensors
- Optical properties and cooling technologies in crystalline materials
- Thermal Expansion and Ionic Conductivity
- Corporate Taxation and Avoidance
- Surface and Thin Film Phenomena
- Infrared Target Detection Methodologies
- Quantum Dots Synthesis And Properties
- Semiconductor Quantum Structures and Devices
- Geophysics and Sensor Technology
- Acoustic Wave Resonator Technologies
- Advanced Semiconductor Detectors and Materials
- Atomic and Subatomic Physics Research
- Superconductivity in MgB2 and Alloys
- Quantum and electron transport phenomena
- Advanced Optical Sensing Technologies
- CCD and CMOS Imaging Sensors
- Chalcogenide Semiconductor Thin Films
University of Science and Technology of China
2021-2024
University of Chinese Academy of Sciences
2024
Shanghai Institute of Technical Physics
2023-2024
Hefei National Center for Physical Sciences at Nanoscale
2021-2024
Shandong University
2019-2021
Weihai Science and Technology Bureau
2019
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....
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...
Abstract Acquiring multi-dimensional optical information, such as intensity, spectrum, polarization, and phase, can significantly enhance the performance of photodetectors. Incorporating these dimensions allows for improved image contrast, enhanced recognition capabilities, reduced interference, better adaptation to complex environments. However, challenge lies in obtaining on a single photodetector. Here we propose misaligned unipolar barrier photodetector based van der Waals heterojunction...
The barrier structure is designed to enhance the operating temperature of infrared detector, thereby improving efficiency collecting photogenerated carriers and reducing dark current generation, without suppressing photocurrent. However, development detectors using conventional materials limited due strict requirements for lattice band matching. In this study, a high-performance unipolar detector utilizing black arsenic phosphorus/molybdenum disulfide/black phosphorus van der Waals...
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...
The lead-free double perovskite Cs2AgInCl6 is a potential candidate for LEDs, the photoluminescence performance of which reinforced greatly by Mn doping. Here, we analyzed geometric, electronic and properties Mn-doped means first-principle calculations. We found that in interior Cs2AgInCl6, dopant formed defect complexes substituting an Ag atom generating vacancy (MnAgVAg) owing to charge balance weak distortion metal octahedra. MnAgVAg introduced two bands forbidden gap, was contributed...
Double perovskite A2BB'X6, including all-inorganic and hybrid organic-inorganic composition, show great potential applications. The role of A cations (organic molecules or inorganic ions) in the double is distinct from that standard perovskite. Therefore, we carried out systematic analyses geometric electronic structures Cs2AgBiBr6 (MA)2AgBiBr6 (MA = CH3NH3) perovskites. maintains cubic lattice. While MA prefer to align [110] direction give rise obvious lattice distortion. band gap slightly...
Intertwined spin and charge orders have been widely studied in high-temperature superconductors, since their fluctuations may facilitate electron pairing; however, they are rarely identified heavily electron-doped iron selenides. Here, using scanning tunneling microscopy, we show that when the superconductivity of (Li0.84Fe0.16OH)Fe1-xSe is suppressed by introducing Fe-site defects, a short-ranged checkerboard order emerges, propagating along Fe-Fe directions with an approximately 2aFe...
Abstract The Cu‐modulated lead‐free double perovskite Cs 2 AgSbCl 6 shows excellent photoelectric performances. Thus the distribution of Cu dopants inside and influence induced by them are investigated thoroughly. variation charge then electronic environment around dopant simulated, which support preferred formation Ag defect in with a nominal monovalent state. Compared other Cu‐related defects, this configuration introduces weakest tensile stress defects slightest distortion metal...
Charge density wave (CDW) can be characterized by the amplitude of its charge modulation and spatial phase coherence amongst CDW superlattice unit cells. The is usually guaranteed for weak-coupling CDW. However, McMillan [Phys. Rev. B 16, 643 (1977)] predicted that in strong coupling regime, fluctuation length could just a few cell size; short-ranged exists above transition, together with gap. In experiments, small domains often associated defects, thus making it difficult to identify role...
The hybrid ferromagnet-superconductor heterostructures have attracted extensive attention as they potentially host topological superconductivity. Relevant experimental signatures recently been reported in CrBr3/NbSe2 heterostructure, but controversies remain. Here, we reinvestigate by an ultralow temperature scanning tunneling microscope with higher spatial and energy resolutions. We find that the single-layer CrBr3 film is insulating acts likely a vacuum barrier, measured superconducting...
Exotic quantum states could be induced due to the interplay of various degrees freedom such as charge, spin, orbital, and lattice. Recently, a novel short-ranged charge order (CO) was discovered deep inside antiferromagnetic phase correlated Kagome magnet FeGe. Since spin-polarization is significantly enhanced in CO state, magnetism may play an important role. However, its nature hinders precise identification properties, mechanism still controversial. Here, we report observation long-ranged...
<title>Abstract</title> Exotic quantum states could be induced due to the interplay of various degrees freedom such as charge, spin, orbital, and lattice. Recently, a novel short-ranged charge order (CO) was discovered deep inside antiferromagnetic phase correlated Kagome magnet FeGe. Since spin-polarization is significantly enhanced in CO state, magnetism may play an important role. However, its nature hinders precise identification properties, mechanism still controversial. Here, we report...
Abstract The acquisition of multi-dimensional optical information, including light intensity, spectrum, polarization, and phase, is a crucial aspect in the advancement next-generation infrared photodetectors. However, information on single photodetector presents significant challenge. Here, we present based van der Waals heterojunction. It can obtain dual-band (2.5–4.2 µm 4.3–4.9 µm) polarization state target by adjusting bias polarity. device employs two anisotropic narrow bandgap...