28 citations · 28 across the 1 of their papers we have counts for
5 papers
Mirror-symmetry-protected dynamical quantum phase transitions in topological crystalline insulators
Ryo Okugawa, Hiroki Oshiyama, Masayuki Ohzeki
Dynamical quantum phase transitions (DQPTs) are topologically characterized in quantum quench dynamics in topological systems. In this paper, we study Loschmidt amplitudes and DQPT…
Non-Hermitian band topology with generalized inversion symmetry
Ryo Okugawa, Ryo Takahashi, Kazuki Yokomizo
Non-Hermitian skin effects and exceptional points are topological phenomena characterized by integer winding numbers. In this study, we give methods to theoretically detect skin ef…
Second-order topological non-Hermitian skin effects
Ryo Okugawa, Ryo Takahashi, Kazuki Yokomizo
Higher-order topology realizes topologically robust corner modes as a manifestation of nontriviality. We theoretically propose non-Hermitian skin effects which stem from second-ord…
Topological exceptional surfaces in non-Hermitian systems with parity-time and parity-particle-hole symmetries
Ryo Okugawa, Takehito Yokoyama
We study a topological band degeneracy in non-Hermitian systems with parity-time () and parity-particle-hole () symmetries. In -dimensional non-Hermitian systems, it is…
Universal phase transition and band structures for spinless nodal-line and Weyl semimetals
Ryo Okugawa, Shuichi Murakami
We study a general phase transition between spinless topological nodal-line semimetal and Weyl semimetal phases. We classify topological nodal lines into two types based on their p…