Entanglement spectrum and entropy in topological non-Hermitian systems and nonunitary conformal field theory

Po Yao Chang, Jhih Shih You, Xueda Wen, Shinsei Ryu

研究成果: 雜誌貢獻期刊論文同行評審

30 引文 斯高帕斯(Scopus)

摘要

We study entanglement properties of free-fermion systems without Hermiticity by use of correlation matrix and overlap matrix in the biorthogonal basis. We find at a critical point in the non-Hermitian Su-Schrieffer-Heeger (SSH) model with parity and time-reversal symmetry (PT symmetry) the entanglement entropy exhibits a logarithmic scaling with corresponding central charge c=-2, signaling the emergence of nonunitary conformal field theory. In addition, we demonstrate that, in the PT-symmetric SSH model and the non-Hermitian Chern insulators, the entanglement spectrum characterizes the topological properties in terms of the existence of mid-gap states.

原文英語
文章編號033069
期刊Physical Review Research
2
發行號3
DOIs
出版狀態已發佈 - 2020 7月
對外發佈

ASJC Scopus subject areas

  • 物理與天文學 (全部)

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