285 citations · 2.6k across the 51 of their papers we have counts for
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First-Principles Design of Halide-Reduced Electrides: Magnetism and Topological Phases
Tonghua Yu, Motoaki Hirayama, José A. Flores-Livas +3
We propose a design scheme for potential electrides derived from conventional materials. Starting with rare-earth-based ternary halides, we exclude halogens and perform global stru…
Enhancement of transverse thermoelectric conductivity originating from stationary points in nodal line
Susumu Minami, Fumiyuki Ishii, Motoaki Hirayama +3
Motivated by the recent discovery of a large anomalous Nernst effect in CoMnGa, Fe (=Al, Ga) and CoSnS, we performed a first-principles study to clarify the…
Magnetic exchange coupling in cuprate-analog nickelates
Yusuke Nomura, Takuya Nomoto, Motoaki Hirayama +1
Motivated by the recent discovery of superconductivity in doped NdNiO, we study the magnetic exchange interaction in layered nickelates from first principles. The mot…
Anomalous dielectric response in insulators with the pi Zak phase
Yusuke Aihara, Motoaki Hirayama, Shuichi Murakami
In various topological phases, nontrivial states appear at the boundaries of the system. In this paper, we investigate anomalous dielectric response caused by such states caused by…
Vortex bound state of Kondo lattice coupled to compensated metal
Shoma Iimura, Motoaki Hirayama, Shintaro Hoshino
We theoretically study physical properties of the low-energy quasiparticle excitations at the vortex core in the full-gap superconducting state of the Kondo lattice coupled to comp…
Higher-Order Topological Crystalline Insulating Phase and Quantized Hinge Charge in Topological Electride Apatite
Motoaki Hirayama, Ryo Takahashi, Satoru Matsuishi +2
In higher-order topological insulators, bulk and surface electronic states are gapped, while there appear gapless hinge states protected by spatial symmetry. Here we show by ab ini…
Material design with the van der Waals stacking of bismuth-halide chains realizing a higher-order topological insulator
Ryo Noguchi, Masaru Kobayashi, Zhanzhi Jiang +28
The van der Waals (vdW) materials with low dimensions have been extensively studied as a platform to generate exotic quantum properties. Advancing this view, a great deal of attent…