Non-Hermitian Mott Skin Effect
- URL: http://arxiv.org/abs/2309.14111v3
- Date: Tue, 20 Feb 2024 13:30:24 GMT
- Title: Non-Hermitian Mott Skin Effect
- Authors: Tsuneya Yoshida, Song-Bo Zhang, Titus Neupert, and Norio Kawakami
- Abstract summary: We propose a novel type of skin effects in non-Hermitian quantum many-body systems.
This phenomenon is induced by the interplay between strong correlations and the non-Hermitian point-gap topology.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We propose a novel type of skin effects in non-Hermitian quantum many-body
systems which we dub a non-Hermitian Mott skin effect. This phenomenon is
induced by the interplay between strong correlations and the non-Hermitian
point-gap topology. The Mott skin effect induces extreme sensitivity to the
boundary conditions only in the spin degree of freedom (i.e., the charge
distribution is not sensitive to boundary conditions), which is in sharp
contrast to the ordinary non-Hermitian skin effect in non-interacting systems.
Concretely, we elucidate that a bosonic non-Hermitian chain exhibits the Mott
skin effect in the strongly correlated regime by closely examining an effective
Hamiltonian. The emergence of the Mott skin effect is also supported by
numerical diagonalization of the bosonic chain. The difference between the
ordinary non-Hermitian skin effect and the Mott skin effect is also reflected
in the time-evolution of physical quantities; under the time-evolution spin
accumulation is observed while the charge distribution remains spatially
uniform.
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