Fate of non-Hermitian free fermions with Wannier-Stark ladder

• URL: http://arxiv.org/abs/2405.19155v2
• Date: Mon, 24 Jun 2024 05:15:36 GMT
• Title: Fate of non-Hermitian free fermions with Wannier-Stark ladder
• Authors: Han-Ze Li, Jian-Xin Zhong,
• Abstract summary: The Wannier-Stark localization dynamically alters the entanglement behavior of non-Hermitian free fermions. We observe the steady state half-chain entanglement entropy and identify two distinct area law regions. Our findings highlight novel entanglement phases emerging from the interplay between the non-Hermitian skin effect and disorder-free localization.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The Wannier-Stark localization dynamically alters the entanglement behavior of non-Hermitian free fermions. Utilizing the single-particle correlation matrix technique, we analyze the effective Hamiltonian of these fermions with a Wannier-Stark ladder. Under open boundary conditions, we observe the steady state half-chain entanglement entropy and identify two distinct area law regions and an algebraic scaling region. Finite-size scaling analysis reveals critical scaling behavior of the half-chain entanglement entropy. Notably, the system demonstrates unique entanglement characteristics under periodic boundary conditions, which diverge from the (1+1)D conformal field theory predictions for Anderson localization. Our findings highlight novel entanglement phases emerging from the interplay between the non-Hermitian skin effect and disorder-free localization.

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