A5060719663- Topological Materials and Phenomena
- Advanced Condensed Matter Physics
- Magnetic properties of thin films
- 2D Materials and Applications
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Rare-earth and actinide compounds
- Acoustic Wave Resonator Technologies
- Iron-based superconductors research
- Advanced Thermoelectric Materials and Devices
- Multiferroics and related materials
- Cold Atom Physics and Bose-Einstein Condensates
- Electronic and Structural Properties of Oxides
Tsinghua University
2022-2024
Antiferromagnetic spintronics have attracted wide attention due to its great potential in constructing ultradense and ultrafast antiferromagnetic memory that suits modern high-performance information technology. The electrical 180° switching of Néel vector is a long-term goal for developing electrical-controllable with opposite vectors as binary “0” “1.” However, the state-of-art mechanisms long been limited 90° or 120° vector, which unavoidably require multiple writing channels contradict...
Abstract The van der Waals antiferromagnetic topological insulator MnBi 2 Te 4 represents a promising platform for exploring the layer-dependent magnetism and states of matter. Recently observed discrepancies between magnetic transport properties have aroused controversies concerning nature in ground state. In this article, we demonstrate that fabrication can induce mismatched even-odd layer dependent magnetotransport few-layer . We perform comprehensive study 6- 7-septuple-layer , reveal...
Abstract The atomically thin MnBi 2 Te 4 crystal is a novel magnetic topological insulator, exhibiting exotic quantum physics. Here we report systematic investigation of ultrafast carrier dynamics and coherent interlayer phonons in few-layer as function layer number using time-resolved pump-probe reflectivity spectroscopy. Pronounced phonon oscillations from the breathing mode are directly observed time domain. We find that oscillation frequency, photocarrier decay rates all depend...
Atomically thin van der Waals magnetic materials have not only provided a fertile playground to explore basic physics in the two-dimensional (2D) limit but also created vast opportunities for novel ultrafast functional devices. Here we systematically investigate magnetization dynamics and spin wave few-layer topological antiferromagnetic MnBi2Te4 crystals as function of layer number, temperature, field. We find laser-induced (de)magnetization processes can be used accurately track distinct...
Antiferromagnetic spintronics have attracted wide attention due to its great potential in constructing ultra-dense and ultra-fast antiferromagnetic memory that suits modern high-performance information technology. The electrical 180o switching of N\'eel vector is a long-term goal for developing electrical-controllable with opposite vectors as binary "0" "1". However, the state-of-art mechanisms long been limited 90o or 120o vector, which unavoidably require multiple writing channels...
In ferromagnetic materials, magnons - quanta of spin waves typically resonate in the gigahertz range. Beyond conventional magnons, while theoretical studies have predicted associated with orbital magnetic moments, their direct observation has remained challenging. Here, we present discovery two distinct terahertz orbitally-coupled magnon resonances topological kagome ferromagnet Co3Sn2S2. Using time-resolved Kerr rotation spectroscopy, pinpoint at 0.61 and 0.49 THz 6 K, surpassing all...
The correlated phenomena of flat bands have been extensively studied in twisted systems. However, the emergent ordered states arising from interactions intrinsic multi-orbital kagome lattice materials remain largely unexplored. In contrast to vanadium-based AV3Sb5 (A = K, Rb, Cs), newly discovered metal CsCr3Sb5, featuring pressurized superconductivity, antiferromagnetism, structural phase transition, and density wave orders, provides a rich platform for investigating strong electron...
The van der Waals antiferromagnetic topological insulator MnBi2Te4 represents a promising platform for exploring the layer-dependent magnetism and states of matter. Recently observed discrepancies between magnetic transport properties have aroused controversies concerning nature in ground state. In this article, we demonstrate that fabrication can induce mismatched even-odd layer dependent magnetotransport few-layer MnBi2Te4. We perform comprehensive study 6- 7-septuple-layer MnBi2Te4,...
The atomically thin MnBi2Te4 crystal is a novel magnetic topological insulator, exhibiting exotic quantum physics. Here we report systematic investigation of ultrafast carrier dynamics and coherent interlayer phonons in few-layer as function layer number using time-resolved pump-probe reflectivity spectroscopy. Pronounced phonon oscillations from the breathing mode are directly observed time domain. We find that oscillation frequency, photocarrier decay rates all depend sensitively on sample...