Correlation versus Dissipation in a Non-Hermitian Anderson Impurity Model

• URL: http://arxiv.org/abs/2408.03494v2
• Date: Mon, 25 Nov 2024 02:02:43 GMT
• Title: Correlation versus Dissipation in a Non-Hermitian Anderson Impurity Model
• Authors: Kazuki Yamamoto, Masaya Nakagawa, Norio Kawakami,
• Abstract summary: We develop a slave-boson theory for a non-Hermitian Anderson impurity model with one-body loss. We unveil the mechanism of a dissipative quantum phase transition of the Kondo state on the basis of this renormalization effect.
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• Abstract: We analyze the competition between strong correlations and dissipation in quantum impurity systems from the Kondo regime to the valence fluctuation regime by developing a slave-boson theory for a non-Hermitian Anderson impurity model with one-body loss. Notably, in the non-Hermitian Kondo regime, strong correlations qualitatively change the nature of dissipation through renormalization effects, where the effective one-body loss is suppressed and emergent many-body dissipation characterized by the complex-valued hybridization is generated. We unveil the mechanism of a dissipative quantum phase transition of the Kondo state on the basis of this renormalization effect, which counterintuitively enhances the lifetime of the impurity against loss. We also find a crossover from the non-Hermitian Kondo regime to the valence fluctuation regime dominated by one-body dissipation. Our results can be tested in a wide variety of setups such as quantum dots coupled to electronic leads and quantum point contacts in ultracold Fermi gases.

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