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Condensed Matter > Disordered Systems and Neural Networks
Title: Fidelity and criticality in the nonreciprocal Aubry-Andr{é}-Harper model
(Submitted on 25 Apr 2024 (v1), last revised 1 May 2024 (this version, v2))
Abstract: We study the critical behaviors of the ground and first excited states in the one-dimensional nonreciprocal Aubry-Andr{\'e}-Harper model using both the self-normal and biorthogonal fidelity susceptibilities. We demonstrate that fidelity susceptibilities serve as a probe for the phase transition in the nonreciprocal AAH model. For ground states, characterized by real eigenenergies across the entire regime, both fidelity susceptibilities near the critical points scale as $N^{2}$, akin to the Hermitian AAH model. However, for the first-excited states, where $\mathcal{PT}$ transitions occur, the fidelity susceptibilities exhibit distinct scaling laws, contingent upon whether the lattice consists of even or odd sites. For even lattices, both the self-normal and and biorthogonal fidelity susceptibilities near the critical points continue to scale as $N^{2}$. In contrast, for odd lattices, the biorthogonal fidelity susceptibilities diverge, while the self-normal fidelity susceptibilities exhibit linear behavior, indicating a novel scaling law.
Submission history
From: Gaoyong Sun [view email][v1] Thu, 25 Apr 2024 16:07:55 GMT (1206kb,D)
[v2] Wed, 1 May 2024 00:28:44 GMT (1211kb,D)
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