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Domain wall of a ferromagnet on a three-dimensional topological insulator
Ryohei Wakatsuki, Motohiko Ezawa, Naoto Nagaosa
Topological insulators (TIs) show rich phenomena and functions which can never be realized in ordinary insulators. Most of them come from the peculiar surface or edge states. Espec…
Arsenene: Two-dimensional buckled and puckered honeycomb arsenic systems
C. Kamal, Motohiko Ezawa
Recently phosphorene, monolayer honeycomb structure of black phosphorus, was experimentally manufactured and attracts rapidly growing interests. Here we investigate stability and e…
Magnetic skyrmion logic gates: conversion, duplication and merging of skyrmions
Xichao Zhang, Motohiko Ezawa, Yan Zhou
Magnetic skyrmions, which are topological particle-like excitations in ferromagnets, have attracted a lot of attention recently. Skyrmionics is an attempt to use magnetic skyrmions…
Antiferromagnetic Topological Superconductor and Electrically Controllable Majorana Fermions
Motohiko Ezawa
We investigate the realization of a topological superconductor in a generic bucked honeycomb system equipped with four types of mass-generating terms, where the superconductor gap…
Magnetic-Field Induced Semimetal in Topological Crystalline Insulator Thin Films
Motohiko Ezawa
We investigate electromagnetic properties of a topological crystalline insulator (TCI) thin film under external electromagnetic fields. The TCI thin film is a topological insulator…
Fermion Fractionalization to Majorana Fermions in Dimerized Kitaev Superconductor
Ryohei Wakatsuki, Motohiko Ezawa, Yukio Tanaka +1
We study theoretically a one-dimensional dimerized Kitaev superconductor model which belongs to BDI class with time-reversal, particle-hole, and chiral symmetries. There are two so…