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  Protection of correlation-induced phase instabilities by exceptional susceptibilities

Reitner, M., Crippa, L., Fus, D. R., Budich, J. C., Toschi, A., & Sangiovanni, G. (2024). Protection of correlation-induced phase instabilities by exceptional susceptibilities. Physical Review Research, 6(2): L022031. doi:10.1103/PhysRevResearch.6.L022031.

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2307.00849v3.pdf (Preprint), 2MB
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Reitner, M.1, Author
Crippa, L.1, Author
Fus, D. R.1, Author
Budich , J. C.1, Author
Toschi, A.1, Author
Sangiovanni, G.1, Author
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 Abstract: 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.

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Language(s): eno - Enggano
 Dates: 2024-05-062024-05-01
 Publication Status: Issued
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Title: Physical Review Research
  Abbreviation : Phys. Rev. Research
Source Genre: Journal
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Publ. Info: College Park, Maryland, United States : American Physical Society (APS)
Pages: - Volume / Issue: 6 (2) Sequence Number: L022031 Start / End Page: - Identifier: ISSN: 2643-1564
CoNE: https://pure.mpg.de/cone/journals/resource/2643-1564