A5050850144- Topological Materials and Phenomena
- 2D Materials and Applications
- Heusler alloys: electronic and magnetic properties
- MXene and MAX Phase Materials
- Electrocatalysts for Energy Conversion
- Advanced Photocatalysis Techniques
- Magnetic properties of thin films
- Graphene research and applications
- Quantum and electron transport phenomena
- Fullerene Chemistry and Applications
- Ammonia Synthesis and Nitrogen Reduction
- Boron and Carbon Nanomaterials Research
The University of Tokyo
2021-2025
Physics of Weyl electrons has been attracting considerable interests and further accelerated by recent discoveries giant anomalous Hall effect (AHE) topological (THE) in several magnetic systems including non-coplanar magnets with spin chirality or small-size skyrmions. These AHEs/THEs are often attributed to the intense Berry curvature generated around nodes accompanied band anti-crossings, yet direct experimental evidence still remains elusive. Here, we demonstrate an essential role...
The discovery of topological insulators and semimetals triggered enormous interest in exploring emergent electromagnetic responses solids. Particular attention has been focused on ternary half-Heusler compounds, whose electronic structure bears analogy to the zinc-blende compounds while also including magnetic rare-earth ions coupled conduction electrons. However, most research this system band-inverted zero-gap semiconductors such as GdPtBi, which still does not fully exhaust large...
Stacking order is expected to have a significant impact on the properties of van der Waals layered magnets, as it determines crystallographic and magnetic symmetry. Recent synchrotron-based optical studies antiferromagnetic MnPS3 revealed thickness-dependent symmetry crossover, suggesting possible different stackings in few-layer crystals from bulk, which, however, has not been explicitly identified. Here, by using combination atomic-scale electron microscopy theoretical calculations, we...
Topological crystalline metals/semimetals (TCMs) have stimulated a great research interest, which broaden the classification of topological phases and provide valuable platform to explore superconductivity. Here, we report discovery superconductivity features in Pb-intercalated transition-metal dichalcogenide Pb$_{1/3}$TaS$_2$. Systematic measurements indicate that Pb$_{1/3}$TaS$_2$ is quasi-two-dimensional (q-2D) type-II superconductor ({\em T}$_c \approx$ 2.8 K) with significantly enhanced...
Materials carrying topological surface states (TSS) provide a fascinating platform for the hydrogen evolution reaction (HER). Based on systematic first-principles calculations ${A}_{3}B$ ($A$ = Ni, Pd, Pt; $B$ Si, Ge, Sn), we propose that electric polarization characterized by Zak phase can be crucial to designing efficient catalysts HER. For ${A}_{3}B$, show takes nontrivial value of $\ensuremath{\pi}$ in whole (111) projected Brillouin zone, which causes quantized charges at surface....
The authors demonstrate a computational scheme of systematically designing new magnetic electrides derived from known conventional solids. Intuitively, we think localized electrons attached to ions in solid. But there is an exceptional class solids, where some localize at the empty space between ions: electrides. These materials can be used as catalysts, or case they are magnetic, for spintronic devices. Only few confirmed, so have implemented state-of-the-art simulations many interacting...
Abstract Topological phases are usually unreachable in molecular solids, which characterized by weakly dispersed energy bands with a large gap, contrast to topological materials. In this work, however, it is proposed that nontrivial electronic topology may ubiquitously emerge class of crystals contain interstitial states, the prone be inverted those orbitals. Guidelines provided hunt for such interstitial‐electron‐induced crystals, especially insulating state. They exhibit variety...
Abstract The discovery of topological insulators and semimetals triggered enormous interest in exploring emergent electromagnetic responses solids. To explore multifunctional states, a particular attention has been focused on ternary half-Heusler compounds, whose electronic structure bears analogy to the zinc-blende compounds which furthermore involve magnetic rare-earth ions coupled conduction electrons [1, 2]. Most them reported so far are band-inverted zero-gap semiconductors such as R...