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Continuous Phase Transition without Gap Closing in Non-Hermitian Quantum Many-Body Systems
Norifumi Matsumoto, Kohei Kawabata, Yuto Ashida +2
Contrary to the conventional wisdom in Hermitian systems, a continuous quantum phase transition between gapped phases is shown to occur without closing the energy gap in non-He…
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…
Topological Origin of Non-Hermitian Skin Effects
Nobuyuki Okuma, Kohei Kawabata, Ken Shiozaki +1
A unique feature of non-Hermitian systems is the skin effect, which is the extreme sensitivity to the boundary conditions. Here, we reveal that the skin effect originates from intr…
Universality classes of non-Hermitian random matrices
Ryusuke Hamazaki, Kohei Kawabata, Naoto Kura +1
Non-Hermitian random matrices have been utilized in such diverse fields as dissipative and stochastic processes, mesoscopic physics, nuclear physics, and neural networks. However,…
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.…