11 papers
Topological metal-insulator transitions in one-dimensional non-Hermitian quasicrystals: beyond PT-symmetry
Guangjie Zhang, Bing Shao, Longwen Zhou +2
One-dimensional non-Hermitian quasicrystals with parity and time-reversal (PT) symmetry can simultaneously exhibit localization-delocalization transition, topological phase transit…
Lateral Shift as a Control Knob for Localization Transitions in a Quasiperiodic Ladder
Bing Shao, Guangjie Zhang, Longwen Zhou +2
This work reports rich localization-delocalization transitions in a quasiperiodic ladder, of which the two legs are subject to the same quasiperiodic onsite potential but can be sh…
Topology and edge modes surviving criticality in non-Hermitian Floquet systems
Longwen Zhou
The discovery of critical points that can host quantized nonlocal order parameters and degenerate edge modes relocate the study of symmetry-protected topological phases (SPTs) to g…
Coupled-wire construction of non-Abelian higher-order topological phases
Jiaxin Pan, Longwen Zhou
Non-Abelian topological charges (NATCs), characterized by their noncommutative algebra, offer a framework for describing multigap topological phases beyond conventional Abelian inv…
Topological characterization of phase transitions and critical edge states in one-dimensional non-Hermitian systems with sublattice symmetry
Longwen Zhou, Rujia Jing, Shenlin Wu
Critical edge states appear at the bulk gap closing points of topological transitions. Their emergence signify the existence of topologically nontrivial critical points, whose desc…
Floquet non-Abelian topological charges and edge states
Jiaxin Pan, Longwen Zhou
Non-Abelian topological insulators are characterized by matrix-valued, non-commuting topological charges with regard to more than one energy gap. Their descriptions go beyond the c…