119 citations · 344 across the 9 of their papers we have counts for
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First-principles study of electric-field-induced topological phase transition in one-bilayer Bi(111)
Hikaru Sawahata, Naoya Yamaguchi, Hiroki Kotaka +1
Using first-principles calculations, we found the topological phase transition induced by electric fields in one-bilayer Bi(111). The bandgap decreased with increasing electric fie…
First-principles study of spin texture and Fermi lines in Bi(111) multi-layer nanofilm
Hiroki Kotaka, Fumiyuki Ishii, Mineo Saito
We have performed a fully relativistic first-principles density functional calculation examining the surface state of bismuth (Bi) (111) multi-layer nanofilm, with up to 20 Bi bila…
First-principles Study of Rashba Effect in Ultra-thin Bismuth Surface Alloys
Naoya Yamaguchi, Hiroki Kotaka, Fumiyuki Ishii
We performed density functional calculations for ultra-thin bismuth surface alloys: surface alloys of bismuth and face-centered cubic metals Bi/(111)-$(\sqrt{3}\times\sqrt{3})R3…
Spin-Orbit Interaction Effects in the Electronic Structure of B20-type CoSi: First-Principles Density Functional Study
Fumiyuki Ishii, Hiroki Kotaka, Takashi Onishi
We have performed fully relativistic first-principles density functional calculations for non-magnetic B20-type CoSi. The spin-orbit interaction has crucial effects on the electron…