Light-Driven Bound State of Interacting Impurities in a Dirac-Like Bath
Fuente:
arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866908685519814656 |
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| author | Kulkarni, Vinayak M. |
| author_facet | Kulkarni, Vinayak M. |
| contents | Strongly correlated quantum impurities under periodic driving can exhibit emergent non-Hermitian phenomena, yet a microscopic understanding has been lacking. We introduce an auxiliary-fermion framework that captures the bath's spin-orbit and angular-momentum structure and generates an effective low-energy theory with symmetry-protected spin-selective gain-loss channels. Exceptional points (EPs) arise dynamically from hybridization, without inserting non-Hermitian terms by hand, while causality is preserved via sign-reversing contributions. Near EPs, eigenvector non-orthogonality strongly enhances the impurity density of states, boosting the Kondo scale according to the condition number of the effective Hamiltonian. This DOS enhancement provides a directly measurable signature of EPs in impurity systems when spin-flip processes are induced experimentally. The pseudo-Hermitian structure further enables a biorthogonal thermodynamic Bethe ansatz treatment of interactions. Our results establish a unified route by which driven environments can engineer correlated, emergent non-Hermitian impurity states, opening a new avenue to control quantum many-body systems far from equilibrium. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_17811 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Light-Driven Bound State of Interacting Impurities in a Dirac-Like Bath Kulkarni, Vinayak M. Strongly Correlated Electrons Strongly correlated quantum impurities under periodic driving can exhibit emergent non-Hermitian phenomena, yet a microscopic understanding has been lacking. We introduce an auxiliary-fermion framework that captures the bath's spin-orbit and angular-momentum structure and generates an effective low-energy theory with symmetry-protected spin-selective gain-loss channels. Exceptional points (EPs) arise dynamically from hybridization, without inserting non-Hermitian terms by hand, while causality is preserved via sign-reversing contributions. Near EPs, eigenvector non-orthogonality strongly enhances the impurity density of states, boosting the Kondo scale according to the condition number of the effective Hamiltonian. This DOS enhancement provides a directly measurable signature of EPs in impurity systems when spin-flip processes are induced experimentally. The pseudo-Hermitian structure further enables a biorthogonal thermodynamic Bethe ansatz treatment of interactions. Our results establish a unified route by which driven environments can engineer correlated, emergent non-Hermitian impurity states, opening a new avenue to control quantum many-body systems far from equilibrium. |
| title | Light-Driven Bound State of Interacting Impurities in a Dirac-Like Bath |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2505.17811 |