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- W4324100404 abstract "Although the non-Bloch band theory is a milestone in elaborating bulk energy bands of non-Hermitian systems under the open-boundary condition (OBC), vital issues related to multivalued functions of non-Hermitian energy bands remain unsolved. In this paper, we anatomize the bulk properties of one-dimensional multiband non-Hermitian systems under OBC. We put forward the energy-band branches (EBBs) to settle the multivalued functions of non-Hermitian energy bands, which become gapped or gapless corresponding to disconnected or connected EBBs in the complex energy plane, where the branch points and branch cuts play a crucial role. We clarify the precise significance of the non-Hermitian skin effect, which illustrates the asymptotic behavior of EBB eigenstates (bulk eigenstates) in the deep bulk and compensates previous non-Bloch band theory. We also obtain a general expression of open-boundary Green's functions based on such EBBs and generalized Brillouin zones, useful for studies on non-Hermitian dynamical evolution." @default.
- W4324100404 created "2023-03-14" @default.
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- W4324100404 date "2023-03-13" @default.
- W4324100404 modified "2023-10-15" @default.
- W4324100404 title "Anatomy of open-boundary bulk in multiband non-Hermitian systems" @default.
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- W4324100404 doi "https://doi.org/10.1103/physrevb.107.115412" @default.
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