Exceptional entanglement in non-Hermitian fermionic models

• URL: http://arxiv.org/abs/2304.08609v1
• Date: Thu, 13 Apr 2023 12:40:11 GMT
• Title: Exceptional entanglement in non-Hermitian fermionic models
• Authors: Wei-Zhu Yi, Yong-Ju Hai, Rong Xiao and Wei-Qiang Chen
• Abstract summary: Exotic singular objects, known as exceptional points, are ubiquitous in non-Hermitian physics. From the entanglement spectrum, zero-energy exceptional modes are found to be distinct from normal zero modes or topological boundary modes.
• Score: 1.8853792538756093
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Exotic singular objects, known as exceptional points, are ubiquitous in non-Hermitian physics. They might be spectral singularities in energy bands that produce anomalous effects and defectiveness. The quantum entanglement of a generic non-Hermitian model with two different types of spectral exceptional points (SEPs) is systematically investigated in this paper. We discovered a relationship between non-unitary conformal field theories and the $k$-linear-type SEPs, which is typically associated with $\mathcal{PT}$-symmetry or pesdo-Hermicity spontaneous breaking. The underlying association between $k$-square-root-type SEPs, which arise concurrently with real (imaginary) gap closing in the complex spectrum, mimicking first-order-phase-transition criticalities, and complex conformal field theories (cCFTs) is addressed through the calculation of complex central charges. From the entanglement spectrum, zero-energy exceptional modes are found to be distinct from normal zero modes or topological boundary modes. Finally, we include a brief discussion of analogous non-Hermitian quantum spin models and endeavor to establish an intuitive understanding of exceptional points through the spin picture in various scenarios.

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