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강상관계 물질 연구단
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Many-body approach to non-Hermitian physics in fermionic systems

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Title
Many-body approach to non-Hermitian physics in fermionic systems
Author(s)
Eunwoo Lee; Hyunjik Lee; Bohm-Jung Yang
Publication Date
2020-03
Journal
PHYSICAL REVIEW B, v.101, no.12, pp.121109 -
Publisher
AMER PHYSICAL SOC
Abstract
In previous studies, the topological invariants of one-dimensional non-Hermitian systems have been defined in open boundary condition (OBC) to satisfy the bulk-boundary correspondence. The extreme sensitivity of bulk energy spectra to boundary conditions has been attributed to the breakdown of the conventional bulk-boundary correspondence based on the topological invariants defined under periodic boundary condition (PBC). Here we propose non-Hermitian many-body polarization as a topological invariant for 1D non-Hermitian systems defined in PBC, which satisfies the bulk-boundary correspondence. Employing many-body methodology in the non-Hermitian Su-Schrieffer-Heeger model for fermions, we show the absence of non-Hermitian skin effect due to the Pauli exclusion principle and demonstrate the bulk-boundary correspondence using the invariant defined under PBC. Moreover, we show that the bulk topological invariant is quantized in the presence of chiral or generalized inversion symmetry. Our study suggests the existence of generalized crystalline symmetries in non-Hermitian systems, which give quantized topological invariants that capture the symmetry-protected topology of non-Hermitian systems. ©2020 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/7096
ISSN
2469-9950
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Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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