40 citations · 135 across the 11 of their papers we have counts for
11 papers
Subspace-Protected Topological Phases and Bulk-Boundary Correspondence
Kenji Shimomura, Ryo Takami, Daichi Nakamura +1
While tremendous research has revealed that symmetry enriches topological phases of matter, more general principles that protect topological phases have yet to be explored. In this…
Hopf Bifurcation of Nonlinear Non-Hermitian Skin Effect
Kohei Kawabata, Daichi Nakamura
The non-Hermitian skin effect, nonreciprocity-induced anomalous localization of an extensive number of eigenstates, represents a hallmark of non-Hermitian topological systems with…
Nonsymmorphic Topological Phases of Non-Hermitian Systems
Daichi Nakamura, Yutaro Tanaka, Ken Shiozaki +1
Non-Hermiticity appears ubiquitously in various open classical and quantum systems and enriches classification of topological phases. However, the role of nonsymmorphic symmetry, c…
Non-Hermitian Hopf insulators
Daichi Nakamura, Kohei Kawabata
Hopf insulators represent a unique class of topological insulators that exist exclusively in two-band systems and are inherently unstable upon the inclusion of additional bands. Me…
Callan-Rubakov effects in topological insulators
Yusuke O. Nakai, Reuel Dsouza, Daichi Nakamura +3
The Callan-Rubakov effect describes monopole-catalyzed proton decay. While this effect is fundamental for quantum field theories, its experimental observation has remained far from…
Exceptional second-order topological insulators
Yutaro Tanaka, Daichi Nakamura, Ryo Okugawa +1
Point-gap topological phases of non-Hermitian systems exhibit exotic boundary states that have no counterparts in Hermitian systems. Here, we develop classification of second-order…
-theory classification of Wannier localizability and detachable topological boundary states
Ken Shiozaki, Daichi Nakamura, Kenji Shimomura +2
A hallmark of certain topology, including the Chern number, is the obstruction to constructing exponentially localized Wannier functions in the bulk bands. Conversely, other types…
Non-Hermitian Origin of Detachable Boundary States in Topological Insulators
Daichi Nakamura, Ken Shiozaki, Kenji Shimomura +2
While topology can impose obstructions to exponentially localized Wannier functions, certain topological insulators are exempt from such Wannier obstructions. The absence of the Wa…
Universal platform of point-gap topological phases from topological materials
Daichi Nakamura, Kazuya Inaka, Nobuyuki Okuma +1
Whereas point-gap topological phases are responsible for exceptional phenomena intrinsic to non-Hermitian systems, their realization in quantum materials is still elusive. Here we…
Topological enhancement of non-normality in non-Hermitian skin effects
Yusuke O. Nakai, Nobuyuki Okuma, Daichi Nakamura +2
The non-Hermitian skin effects are representative phenomena intrinsic to non-Hermitian systems: the energy spectra and eigenstates under the open boundary condition (OBC) drastical…
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…