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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2307.00849 |
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| _version_ | 1866929336640077824 |
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| author | Reitner, Matthias Crippa, Lorenzo Fus, Dominik Robert Budich, Jan Carl Toschi, Alessandro Sangiovanni, Giorgio |
| author_facet | Reitner, Matthias Crippa, Lorenzo Fus, Dominik Robert Budich, Jan Carl Toschi, Alessandro Sangiovanni, Giorgio |
| contents | At thermal equilibrium, we find that generalized susceptibilities encoding the static physical response properties of Hermitian many-electron systems possess inherent non-Hermitian (NH) matrix symmetries. This leads to the generic occurrence of exceptional points (EPs), i.e., NH spectral degeneracies, in the generalized susceptibilities of prototypical Fermi-Hubbard models, as a function of a single parameter such as chemical potential. We demonstrate that these EPs are necessary to promote correlation-induced thermodynamic instabilities, such as phase-separation occurring in the proximity of a Mott transition, to a topologically stable phenomenon. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_00849 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Protection of Correlation-Induced Phase Instabilities by Exceptional Susceptibilities Reitner, Matthias Crippa, Lorenzo Fus, Dominik Robert Budich, Jan Carl Toschi, Alessandro Sangiovanni, Giorgio Strongly Correlated Electrons At thermal equilibrium, we find that generalized susceptibilities encoding the static physical response properties of Hermitian many-electron systems possess inherent non-Hermitian (NH) matrix symmetries. This leads to the generic occurrence of exceptional points (EPs), i.e., NH spectral degeneracies, in the generalized susceptibilities of prototypical Fermi-Hubbard models, as a function of a single parameter such as chemical potential. We demonstrate that these EPs are necessary to promote correlation-induced thermodynamic instabilities, such as phase-separation occurring in the proximity of a Mott transition, to a topologically stable phenomenon. |
| title | Protection of Correlation-Induced Phase Instabilities by Exceptional Susceptibilities |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2307.00849 |