A5083892665- Topological Materials and Phenomena
- Heusler alloys: electronic and magnetic properties
- Advanced Condensed Matter Physics
- Graphene research and applications
- Magnetic properties of thin films
- 2D Materials and Applications
- Magnetic and transport properties of perovskites and related materials
- Rare-earth and actinide compounds
- MXene and MAX Phase Materials
- Iron-based superconductors research
- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- Advanced Thermoelectric Materials and Devices
- Inorganic Chemistry and Materials
- Electronic and Structural Properties of Oxides
- Intermetallics and Advanced Alloy Properties
- Multiferroics and related materials
- Magnetic Properties of Alloys
- Chalcogenide Semiconductor Thin Films
- Shape Memory Alloy Transformations
- Electrocatalysts for Energy Conversion
- Crystal Structures and Properties
- X-ray Diffraction in Crystallography
- Quantum, superfluid, helium dynamics
- ZnO doping and properties
Max Planck Institute for Chemical Physics of Solids
2016-2025
Max Planck Society
2015-2024
TU Dresden
2015-2024
University of Basel
2024
Max Planck Institute of Microstructure Physics
2021-2023
Complexity and Topology in Quantum Matter
2020-2022
Canadian Institute for Advanced Research
2020-2022
Ningbo Institute of Industrial Technology
2022
Chinese Academy of Sciences
2022
Shanghai University
2022
Topological insulators and topological semimetals are both new classes of quantum materials, which characterized by surface states induced the topology bulk band structure. Dirac or Weyl show linear dispersion round nodes, termed points, as three-dimensional analogue graphene. We review basic concepts compare these matter from materials perspective with a special focus on semimetals. The TaAs family is ideal class to introduce signatures points in pedagogical way, Fermi arcs chiral...
Abstract Weyl semimetals (WSMs) are topological quantum states wherein the electronic bands disperse linearly around pairs of nodes with fixed chirality, points. In WSMs, nonorthogonal electric and magnetic fields induce an exotic phenomenon known as chiral anomaly, resulting in unconventional negative longitudinal magnetoresistance, chiral-magnetic effect. However, it remains open question to which extent this effect survives when chirality is not well-defined. Here, we establish detailed...
The search for highly efficient and low‐cost catalysts is one of the main driving forces in catalytic chemistry. Current strategies catalyst design focus on increasing number activity local sites, such as edge sites molybdenum disulfides hydrogen evolution reaction (HER). Here, study proposes demonstrates a different principle that goes beyond site optimization by utilizing topological electronic states to spur activity. For HER, excellent have been found among transition‐metal...
The rare-earth monopnictide LaBi exhibits exotic magneto-transport properties including an extremely large and anisotropic magnetoresistance. Experimental evidence for topological surface states is still missing although band inversions have been postulated to induce a phase in LaBi. By employing angle-resolved photoemission spectroscopy (ARPES) conjunction with $ab~initio$ calculations, we revealed the existence of through observation three Dirac cones: two coexist at corners one appears...
In quantum field theory, we learn that fermions come in three varieties: Majorana, Weyl, and Dirac. Here show solid state systems this classification is incomplete find several additional types of crystal symmetry-protected free fermionic excitations . We exhaustively classify linear quadratic 3-, 6- 8- band crossings stabilized by space group symmetries with spin-orbit coupling time-reversal symmetry. Several distinct arise, differentiated their degeneracies at along high symmetry points,...
Spintronics is a multidisciplinary field involving physics, chemistry, and engineering, new research area for solid-state scientists. A variety of materials must be found to satisfy different demands. The search ferromagnetic semiconductors stable half-metallic ferromagnets with Curie temperatures higher than room temperature remains priority chemistry. general understanding structure-property relationships necessary prerequisite the design materials. In this Review, most important...
It is well established that the anomalous Hall effect a ferromagnet displays scales with its magnetization. Therefore, an antiferromagnet has no net magnetization should exhibit effect. Here we show non-collinear triangular Mn3Ge exhibits large comparable to of ferromagnetic metals; magnitude conductivity 500 per ohm cm at 2 K and 50 room temperature. The angular dependence measurements confirm small residual in-plane magnetic moment role in observed Our theoretical calculations demonstrate...
Abstract Transition metal dichalcogenides have attracted research interest over the last few decades due to their interesting structural chemistry, unusual electronic properties, rich intercalation chemistry and wide spectrum of potential applications. Despite fact that majority related focuses on semiconducting transition-metal (for example, MoS 2 ), recently discovered unexpected properties WTe are provoking strong in semimetallic transition featuring large magnetoresistance,...
Weyl semimetals are crystalline solids that host emergent relativistic fermions and have characteristic surface Fermi-arcs in their electronic structure. with broken time reversal symmetry difficult to identify unambiguously. In this work, using angle-resolved photoemission spectroscopy, we visualized the structure of ferromagnetic crystal Co3Sn2S2 discovered its linear bulk band dispersions across points. These results establish as a magnetic semimetal may serve platform for realizing...
The recently discovered iron arsenide superconductors appear to display a universal set of characteristic features, including proximity magnetically ordered state and robustness the superconductivity in presence disorder. Here we show that ${\text{Fe}}_{1+\ensuremath{\delta}}\text{Se}$, which can be considered parent compound superconducting family, is destroyed by very small changes stoichiometry. Further, nonsuperconducting ${\text{Fe}}_{1+\ensuremath{\delta}}\text{Se}$ not down 5 K. These...
In this work, results of {\it ab-initio} band structure calculations for $A_2BC$ Heusler compounds that have $A$ and $B$ sites occupied by transition metals $C$ a main group element are presented. This class materials includes some interesting half-metallic ferromagnetic properties. The been performed in order to understand the properties minority gap peculiar magnetic behavior found these materials. Among aspects electronic contributions from both atoms states near Fermi energy total...
We investigate the orthorhombic phase $({T}_{d})$ of layered transition-metal dichalcogenide ${\mathrm{MoTe}}_{2}$ as a Weyl semimetal candidate. exhibits four pairs points lying slightly above $(\ensuremath{\sim}6\phantom{\rule{0.16em}{0ex}}\mathrm{meV})$ Fermi energy in bulk band structure. Different from its cousin ${\mathrm{WTe}}_{2}$, which was recently predicted to be type-II semimetal, spacing between each pair is found large 4% reciprocal lattice (six times larger than that...
Gold surfaces host special electronic states that have been understood as a prototype of Shockley surface (SSs). These SSs are commonly employed to benchmark the capability angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling spectroscopy. We find these can be reinterpreted topologically derived (TDSSs) topological insulator (TI), recently discovered quantum state. Based on band structure calculations, Z2 invariant well defined characterize nontrivial features gold we...
In this work a simple concept was used for systematic search materials with high spin polarization. It is based on two semiempirical models. First, the Slater-Pauling rule estimation of magnetic moment. This model well supported by electronic structure calculations. The second found particularly ${\mathrm{Co}}_{2}$ Heusler compounds when comparing their properties. turned out that these exhibit seemingly linear dependence Curie temperature as function Stimulated models,...
In this Letter we show that superconducting ${\mathrm{Fe}}_{1.01}\mathrm{Se}$ undergoes a structural transition at 90 K from tetragonal to an orthorhombic phase but nonsuperconducting ${\mathrm{Fe}}_{1.03}\mathrm{Se}$ does not. High resolution electron microscopy low temperatures further reveals unexpected additional modulation of the crystal structure involves displacements Fe atoms, and composition shows different, complex nanometer-scale modulation. Finally, magnetism is not driving force...