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Quantum anomaly, non-Hermitian skin effects, and entanglement entropy in open systems
Nobuyuki Okuma, Masatoshi Sato
We investigate the roles of non-Hermitian topology in spectral properties and entanglement structures of open systems. In terms of spectral theory, we give a unified understanding…
Majorana multipole response: General theory and application to wallpaper groups
Shingo Kobayashi, Yuki Yamazaki, Ai Yamakage +1
Whereas identification of Cooper pair symmetry is the first and crucial step in the investigation of unconventional superconductors, only a few have been established so far because…
Non-Hermitian Skin Effects in Hermitian Correlated/Disordered Systems: Boundary-Sensitive/Insensitive Quantities and Pseudo Quantum Number
Nobuyuki Okuma, Masatoshi Sato
There is a common belief in the condensed matter community that bulk quantities become insensitive to the boundary condition in the infinite-volume limit. Here we reconsider this s…
Higher-order non-Hermitian skin effect
Kohei Kawabata, Masatoshi Sato, Ken Shiozaki
The non-Hermitian skin effect is a unique feature of non-Hermitian systems, in which an extensive number of boundary modes appear under the open boundary conditions. Here, we disco…
Hermitian zero modes protected by nonnormality: Application of pseudospectra
Nobuyuki Okuma, Masatoshi Sato
Recently, it was established that there exists a direct relation between the non-Hermitian skin effects, -strong dependence of spectra on boundary conditions for non-Hermitian Hami…
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…