A non-Hermitian critical point and the correlation length of strongly correlated quantum systems

Abstract

We study a non-Hermitian generalization of quantum systems in which an imaginary vector potential is added to the momentum operator. In the tight-binding approximation, we make the hopping energy asymmetric in the Hermitian Hamiltonian. In a previous article, we conjectured that the non-Hermitian critical point where the energy gap vanishes is equal to the inverse correlation length of the Hermitian system and we confirmed the conjecture for two exactly solvable systems. In this article, we present more evidence for the conjecture. We also argue the basis of our conjecture by noting the dispersion relation of the elementary excitation.

arXiv comment25 pages, 18 figures

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• Scaling theory of the Mott-Hubbard metal-insulator transition in one dimension
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• Non-linear doublon production in a Mott insulator --- Landau-Dykhne method applied to an integrable model
• Many-body topology of non-Hermitian systems
• Universal properties of dissipative Tomonaga-Luttinger liquids: Case study of a non-Hermitian XXZ spin chain
• Dielectric Breakdown in a Mott Insulator: Many-body Schwinger-Landau-Zener Mechanism studied with a Generalized Bethe Ansatz
• Multifractality of many-body non-Hermitian skin effect
• Spin-Depairing Transition of Attractive Fermi Gases on a Ring Driven by Synthetic Gauge Fields