28 citations · 55 across the 4 of their papers we have counts for
9 papers · 1 filter
Non-Hermitian skin effect enforced by nonsymmorphic symmetries
Yutaro Tanaka, Ryo Takahashi, Ryo Okugawa
Crystal symmetries play an essential role in band structures of non-Hermitian Hamiltonian. In this paper, we propose a non-Hermitian skin effect (NHSE) enforced by nonsymmorphic sy…
Discriminant indicators with generalized inversion symmetry
Tsuneya Yoshida, Ryo Okugawa, Yasuhiro Hatsugai
We propose indicators of the discriminant for systems with generalized inversion symmetry which are computed from data only at high-symmetry points in the Brillouin zone. Our appro…
Rotoinversion-symmetric bulk-hinge correspondence and its applications to higher-order Weyl semimetals
Yutaro Tanaka, Ryo Takahashi, Ryo Okugawa +1
We give a bulk-hinge correspondence for higher-order topological phases protected by rotoinversion symmetry in magnetic systems. Our approach allows us to show t…
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…