A5021831083- Topological Materials and Phenomena
- 2D Materials and Applications
- Graphene research and applications
- Quantum and electron transport phenomena
- Magnetic and transport properties of perovskites and related materials
- Inorganic Chemistry and Materials
- Advanced Condensed Matter Physics
- Organic and Molecular Conductors Research
- Electronic and Structural Properties of Oxides
- Advanced Chemical Physics Studies
- Crystal Structures and Properties
- Acoustic Wave Resonator Technologies
- Iron-based superconductors research
- Surface and Thin Film Phenomena
- Fullerene Chemistry and Applications
- Mechanical and Optical Resonators
- Chalcogenide Semiconductor Thin Films
- Laser-Matter Interactions and Applications
- Advanced Optical Sensing Technologies
- Rare-earth and actinide compounds
- Magnetism in coordination complexes
- Inorganic Fluorides and Related Compounds
- Solid-state spectroscopy and crystallography
- Phase-change materials and chalcogenides
- Physics of Superconductivity and Magnetism
Institute of Physics
2022-2024
Chinese Academy of Sciences
2022-2024
University of Chinese Academy of Sciences
2022-2024
Czech Academy of Sciences, Institute of Physics
2024
National Laboratory for Superconductivity
2024
In condensed matter physics, materials with kagome lattice display a range of exotic quantum states, including charge density wave (CDW), superconductivity, and magnetism. Recently, the intermetallic metal ${\mathrm{ScV}}_{6}{\mathrm{Sn}}_{6}$ was discovered to undergo first-order structural phase transition formation $\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}\ifmmode\times\else\texttimes\fi{}3$ CDW at around 92 K. The bulk electronic band properties are crucial understanding origin...
The researchers here shed new light on the elusive single-particle model of twisted bilayer MoTe${}_{2}$, a material recently highlighted for hosting fractional Chern insulators at zero magnetic field. By leveraging an advanced machine learning method and density functional theory, team meticulously maps out band structure across various twist angles, revealing pivotal inversion refining theoretical landscape. enhancing continuum with higher harmonic terms, they unveil opposite numbers in...
In high harmonic generation from certain solids, a vector that measures the shift of photoexcited electron and hole plays prominent role in excitation recollision mechanism for electrons strong laser fields.
Heat current in ferromagnets can generate a transverse electric voltage perpendicular to magnetization, known as anomalous Nernst effect (ANE). ANE originates intrinsically from the combination of large Berry curvature and density states near Fermi energy. It shows technical advantages over conventional longitudinal Seebeck converting waste heat electricity due its unique geometry. However, materials showing giant remain be explored. Herein, thermopower Syx ≈ 2 µV K-1 at room temperature...
At ambient conditions <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:msub><a:mi>SrAl</a:mi><a:mn>4</a:mn></a:msub></a:math> adopts the <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:msub><b:mi>BaAl</b:mi><b:mn>4</b:mn></b:msub></b:math> structure type with space group <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mrow><c:mi>I</c:mi><c:mn>4</c:mn><c:mo>/</c:mo><c:mi>m</c:mi><c:mi>m</c:mi><c:mi>m</c:mi></c:mrow></c:math>. It undergoes a charge-density-wave (CDW)...
Abstract The magnetic type-II Weyl semimetal (MWSM) Co 3 Sn 2 S has recently been found to host a variety of remarkable phenomena including surface Fermi-arcs, giant anomalous Hall effect, and negative flat band magnetism. However, the dynamic properties remain relatively unexplored. Here, we investigate ultrafast spin dynamics crystal using time-resolved magneto-optical Kerr effect reflectivity spectroscopies. We observe transient magnetization behavior, consisting spin-flipping dominated...
Extensive investigations on topological phase transition (TPT) in three-dimensional compounds have been done. whereas, rare two-dimensional systems, let alone noncentrosymmetric materials. In this work, based first-principles calculations, we explore an inversion symmetry broken structural ReC2H monolayer. We reveal that it undergoes two TPTs, namely from normal insulator to Z2 and back insulator, at the critical biaxial strain of 2.3% 7.8%, respectively. The band occurs generic momentum...
Interest in ZrTe5 has been reinvigorated recent years owing to its potential for hosting versatile topological electronic states and intriguing experimental discoveries. However, the mechanism of many unusual transport behaviors remains controversial: example, characteristic peak temperature-dependent resistivity anomalous Hall effect. Here, through employing a clean dry-transfer fabrication method an inert environment, we successfully obtain high-quality thin devices that exhibit clear...
Beyond conventional ferromagnetism and antiferromagnetism, altermagnetism is a recently discovered unconventional magnetic phase characterized by time-reversal symmetry breaking spin-split band structures in materials with zero net magnetization. This distinct not only enriches the understanding of fundamental physical concepts but also has profound impacts on condense-matter physics research practical device applications. Spin-polarized have been observed semiconductors MnTe MnTe2 vanishing...
The Hall effect, ever intriguing since its discovery, has spurred the exploration of phenomena, intensified by advances in topology and novel materials. Differentiating ordinary effect from extraordinary properties like anomalous (AHE) is challenging, especially materials with topological origins. In our study, we leverage semiclassical Boltzmann transport theory first-principles calculations within relaxation time approximation to analyze effects comprehensively. We have found that complex...
The bulk photovoltaic (BPV) effect that converts light into electric current is highly sensitive to the system symmetry and its electronic Bloch wave function. To create a sizable net current, it necessary break centrosymmetry $\mathcal{P}$ in host material. While prior studies mainly focus on $\mathcal{P}$-broken nonmagnetic (time reversal $\mathcal{T}$ reserved) collinear antiferromagnetic $\mathcal{PT}$ systems, here we adopt magnetic group theory scrutinize how helical spin polarization...
In this work, we synthesized single crystals of ${\mathrm{La}}_{3}\mathrm{Mg}{\mathrm{Bi}}_{5}$ and systematically investigated their structure, magnetism, transport properties. belongs to the ${A}_{3}M{X}_{5}$ family (A = Ca-Ba or rare earth, M transition materials Mg, X chalcogen pnictogen) has a quasi-one-dimensional structure. Our magnetic magnetoresistance measurements show presence de Haas--van Alphen (dHvA) Shubnikov--de Haas (SdH) oscillations. Analysis these quantum oscillation...
Abstract The bulk photovoltaic effect (BPVE) is a second-order optical process in noncentrosymmetric materials that converts the light into DC currents. BPVE classified shift current and injection according to generation mechanisms their dependence on polarization of sensitive spatial time-reversal symmetry materials. In this work, we present comprehensive study response $\mathrm{EuSn_{2}As_{2}}$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>E</mml:mi>...
The origin of anomalous resistivity peak and accompanied sign reversal Hall ZrTe$_5$ has been under debate for a long time. Although various theoretical models have proposed to account these intriguing transport properties, systematic study from first principles view is still lacking. In this work, we present calculation combined with Boltzmann theory investigate the properties in narrow-gap semiconductors at different temperatures doping densities within relaxation time approximation....
The Hall effect has been a fascinating topic ever since its discovery, resulting in exploration of entire family this intriguing phenomena. As the field topology develops and novel materials emerge endlessly over past few decades, researchers have passionately debating origins various effects. Differentiating between ordinary extraordinary transport properties, like anomalous effect, can be quite challenging, especially high-conductivity materials, including those with topological origins....
Abstract The origin of resistivity peak and sign reversal Hall in ZrTe 5 has long been debated. Despite various theories proposed to explain these unique transport properties, there’s a lack comprehensive first principles studies. In this work, we employ calculations Boltzmann theory explore properties narrow-gap semiconductors across varying temperatures doping levels within the relaxation time approximation. We simulate temperature-sensitive chemical potential through proper...
We introduce a new class of moir\'e systems and materials based on monolayers with triangular lattices low-energy states at the M points Brillouin zone. These M-point are fundamentally distinct from those derived $\Gamma$- or K-point monolayers, featuring three time-reversal-preserving valleys related by three-fold rotational symmetry. propose twisted bilayers experimentally exfoliable 1T-SnSe$_2$ 1T-ZrS$_2$ as realizations this class. Using extensive ab initio simulations, we develop...
The optical conductivity of the new Dirac semimetal candidate ${\mathrm{Ir}}_{2}{\mathrm{In}}_{8}\mathrm{Se}$ is measured in a frequency range from 40 to 30 000 ${\mathrm{cm}}^{\ensuremath{-}1}$ at temperatures 300 K down 10 K. measurement reveals that compound low carrier density metal. We find real part ${\ensuremath{\sigma}}_{1}(\ensuremath{\omega})$ linear over broad 500 4000 and varies slightly with cooling. This linearity strongly suggests presence three-dimensional electronic bands...
The bulk photovoltaic effect (BPVE) is a second-order optical process in noncentrosymmetric materials that converts the light into DC currents. BPVE classified shift current and injection according to generation mechanisms, whose dependence on polarization of sensitive spatial time-reversal symmetry materials. In this work, we present comprehensive study response $EuSn_2As_2$ with different magnetic structures through analysis first-principles calculation. We demonstrate interlayer...
Interest in ZrTe5 has been reinvigorated recent years owing to its potential for hosting versatile topological electronic states and intriguing experimental discoveries. However, the mechanism of many unusual transport behaviors remains controversial, example, characteristic peak temperature-dependent resistivity anomalous Hall effect. Here, through employing a clean dry-transfer fabrication method under inert environment, we successfully obtain high-quality thin devices that exhibit clear...
At ambient conditions SrAl4 adopts the BaAl4 structure type with space group I4/mmm. It undergoes a charge-density-wave (CDW) transition at TCDW = 243 K, followed by structural TS 87 K. Temperature-dependent single-crystal X-ray diffraction (SXRD) leads to observation of incommensurate superlattice reflections q \sigma c* 0.1116 200 The CDW has orthorhombic symmetry acentric superspace F222(00sigma)00s, where F222 is subgroup Fmmm as well Atomic displacements mainly represent transverse...