3 papers
cond-mat.mes-hall2024
Origin of Robust Topological Phases in Stacked Hermitian Systems: Non-Hermitian Level Repulsion
Zhiyu Jiang, Masatoshi Sato, Hideaki Obuse
Quantum spin Hall insulators, which possess a non-trivial topological phase, have attracted great attention for two decades. It is generally believed that when an ev…
quant-ph2024
Proposal of a quantum version of active particles via a nonunitary quantum walk
Manami Yamagishi, Naomichi Hatano, Hideaki Obuse
The main aim of the present paper is to define an active particle in a quantum framework as a minimal model of quantum active matter and investigate the differences and similaritie…
cond-mat.mes-hall2024
Dual Symmetry Classification of Non-Hermitian Systems and Point-Gap Topology of a Non-Unitary Quantum Walk
Zhiyu Jiang, Ryo Okamoto, Hideaki Obuse
Non-Hermitian systems exhibit richer topological properties compared to their Hermitian counterparts. It is well known that non-Hermitian systems have been classified based on eith…