53 citations · 114 across the 4 of their papers we have counts for
6 papers
Bulk-boundary correspondence in point-gap topological phases
Daichi Nakamura, Takumi Bessho, Masatoshi Sato
A striking feature of non-Hermitian systems is the presence of two different types of topology. One generalizes Hermitian topological phases, and the other is intrinsic to non-Herm…
Extrinsic topology of Floquet anomalous boundary states in quantum walks
Takumi Bessho, Ken Mochizuki, Hideaki Obuse +1
Bulk-boundary correspondence is a fundamental principle for topological phases where bulk topology determines gapless boundary states. On the other hand, it has been known that cor…
Nielsen-Ninomiya Theorem with Bulk Topology: Duality in Floquet and Non-Hermitian Systems
Takumi Bessho, Masatoshi Sato
The Nielsen-Ninomiya theorem is a fundamental theorem on the realization of chiral fermions in static lattice systems in high-energy and condensed matter physics. Here we extend th…
Topological Quantum Walk with Discrete Time-Glide Symmetry
Ken Mochizuki, Takumi Bessho, Masatoshi Sato +1
Discrete quantum walks are periodically driven systems with discrete time evolution. In contrast to ordinary Floquet systems, no microscopic Hamiltonian exists, and the one-period…
Topological Classificaton of Non-Hermitian Gapless Phases: Exceptional Points and Bulk Fermi Arcs
Takumi Bessho, Kohei Kawabata, Masatoshi Sato
We provide classification of gapless phases in non-Hermitian systems according to two types of complex-energy gaps: point gap and line gap. We show that exceptional points, at whic…
Classification of Exceptional Points and Non-Hermitian Topological Semimetals
Kohei Kawabata, Takumi Bessho, Masatoshi Sato
Exceptional points are universal level degeneracies induced by non-Hermiticity. Whereas past decades witnessed their new physics, the unified understanding has yet to be obtained.…