A5080418401- Topological Materials and Phenomena
- Electronic and Structural Properties of Oxides
- Physics of Superconductivity and Magnetism
- Quantum and electron transport phenomena
- Iron-based superconductors research
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Seaweed-derived Bioactive Compounds
- Surface and Thin Film Phenomena
- Supramolecular Self-Assembly in Materials
- Rare-earth and actinide compounds
- Cold Atom Physics and Bose-Einstein Condensates
- Proteins in Food Systems
- Microbial Metabolites in Food Biotechnology
- 2D Materials and Applications
- Magnetic properties of thin films
- Hydrogels: synthesis, properties, applications
- Atomic and Subatomic Physics Research
- Quantum many-body systems
Chinese People's Armed Police Force Engineering University
2025
Tsinghua University
2020-2024
Beijing Academy of Quantum Information Sciences
2020-2024
State Key Laboratory of Low-Dimensional Quantum Physics
2020-2023
ABSTRACT The intrinsic magnetic topological insulator MnBi2Te4 provides a feasible pathway to the high-temperature quantum anomalous Hall (QAH) effect as well various novel phases. Although quantized transport properties have been observed in exfoliated thin flakes, it remains big challenge achieve molecular beam epitaxy (MBE)-grown films even close regime. In this work, we report realization of resistivity MBE-grown with chemical potential tuned by both controlled situ oxygen exposure and...
Intrinsic magnetic topological insulator MnBi2Te4 is the key to realizing quantum anomalous Hall effect and other related phenomena at a sufficiently high temperature for their practical electronic applications. The research progress on novel material, however, severely hindered by extreme difficulty in preparing its high-quality thin films with well-controlled composition thickness. Combining molecular beam epitaxy (MBE) situ angle-resolved photoemission spectroscopy (ARPES), we have...
Superconductivity transition temperature (
We investigate the quantum anomalous Hall plateau transition in presence of independent out-of-plane and in-plane magnetic fields. The perpendicular coercive field, zero width, peak resistance value can all be systematically controlled by field. traces taken at various fields almost collapse into a single curve when field vector is renormalized to an angle as geometric parameter. These results explained consistently competition between anisotropy Zeeman close relationship transport domain...
In this study, we investigate intrinsic magnetic topological insulator MnBi2Te4 thin films grown by molecular beam epitaxy. We observe a reentrant quantum anomalous Hall effect when the Fermi energy enters valance band and field equals zero, indicating emergence of Chern Anderson state. The discovery opens new avenue for realizing QAH underscores fundamental role both Berry curvature localization.
We report transport measurements on Josephson junctions consisting of Bi2Te3 topological insulator (TI) thin films contacted by superconducting Nb electrodes. For a device with junction length L = 134 nm, the critical supercurrent Ic can be modulated an electrical gate which tunes carrier type and density TI film. reach minimum when is near charge neutrality regime Fermi energy lying close to Dirac point surface state. In p-type current well described short ballistic model. n-type at 0.7 K <...
Abstract Interface superconductivity, realized in multiple artificial crystalline heterostructures, is one of the most exciting directions to search for high-temperature superconductivity. In this work, we prepare bulk (FeSe) η (SrTiO 3 ) 1− multi-grain composites by a simple facile liquid-phase compaction method using spark-plasma-sintering technique. Combining transmission electron microscopy/scanning microscopy and x-ray diffraction investigations, demonstrate that consist micron-scale...
Anderson localization is anticipated to play a pivotal role in the manifestation of quantum anomalous Hall effect, akin its conventional effects. The significance particularly pronounced elucidating reasons behind fragility observed state intrinsic magnetic topological insulator MnBi2Te4 with large predicted gap. Here, employing varying sized micro/nano-structures fabricated from single molecular-beam-epitaxy-grown thin film, we have carried out systematic size- and temperature-dependent...
Grain-boundary Josephson junctions formed by epitaxial growth of high-temperature (${T}_{\mathrm{c}}$) superconductor films on bicrystal substrates have been employed to determine the pairing symmetry high-${T}_{\mathrm{c}}$ superconductivity. Since superconductivity predominately takes place within a single unit cell along $c$ axis and superconducting coherence length is typically in nanometer scale, microstructure grain boundaries crucial for fabricating required tunneling study. In this...