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PreprintarXiv licencearXiv

Interplay between photon condensation and electron-electron interactions in molecular systems

  • Matteo Parisi
  • Elisabetta Paladino
  • Giuseppe A. Falci
  • Gian Marcello Andolina
  • Salvatore Savasta
  • Marco Polini
  • Francesco M. D. Pellegrino
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Abstract

We investigate a minimal molecular model consisting of square planar plaquettes hosting multiple electrons, whose dynamics is governed by a tight-binding Hamiltonian supplemented by on-site Hubbard repulsion. By coupling this system to a spatially nonuniform cavity mode, we analyze the emergence of a magnetostatic instability, namely photon condensation, originating from the paramagnetic Van Vleck mechanism. The global behavior of the system is analyzed for different electronic filling factors, and we find that, except for the special cases of half-filling and a single electron, where the transition, if it occurs, is necessarily a second-order phase transition, the global system may also undergo a first-order transition because of the action of the electron-electron interaction. The polaritonic excitation energies are analyzed, providing clear spectroscopic signatures of the magnetostatic instability and of its order

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Cite

BibTeXRIS
BibTeX
@misc{parisi2026interplay,
  title = {{Interplay between photon condensation and electron-electron interactions in molecular systems}},
  author = {Matteo Parisi and Elisabetta Paladino and Giuseppe A. Falci and Gian Marcello Andolina and Salvatore Savasta and Marco Polini and Francesco M. D. Pellegrino},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2606.11060},
  eprint = {2606.11060},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.11060},
}
RIS
TY  - UNPB
TI  - Interplay between photon condensation and electron-electron interactions in molecular systems
AU  - Matteo Parisi
AU  - Elisabetta Paladino
AU  - Giuseppe A. Falci
AU  - Gian Marcello Andolina
AU  - Salvatore Savasta
AU  - Marco Polini
AU  - Francesco M. D. Pellegrino
PY  - 2026
DA  - 2026/10/20
PB  - arXiv
DO  - 10.48550/arxiv.2606.11060
UR  - https://arxiv.org/abs/2606.11060
AB  - We investigate a minimal molecular model consisting of square planar plaquettes hosting multiple electrons, whose dynamics is governed by a tight-binding Hamiltonian supplemented by on-site Hubbard repulsion. By coupling this system to a spatially nonuniform cavity mode, we analyze the emergence of a magnetostatic instability, namely photon condensation, originating from the paramagnetic Van Vleck mechanism. The global behavior of the system is analyzed for different electronic filling factors, and we find that, except for the special cases of half-filling and a single electron, where the transition, if it occurs, is necessarily a second-order phase transition, the global system may also undergo a first-order transition because of the action of the electron-electron interaction. The polaritonic excitation energies are analyzed, providing clear spectroscopic signatures of the magnetostatic instability and of its order
ER  -