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Effective Enhancement of the Electron-Phonon Coupling Driven by Nonperturbative Electronic Density Fluctuations

E. Moghadas1, M. Reitner1, T. Wehling2, G. Sangiovanni3, S. Ciuchi4, and A. Toschi1

  • 1Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria
  • 2I. Institute for Theoretical Physics, Universität Hamburg, Notkestraße 9–11, 22607 Hamburg, Germany
  • 3Institut für Theoretische Physik und Astrophysik and Würzburg-Dresden Cluster of Excellence ctd.qmat, Universität Würzburg, 97074 Würzburg, Germany
  • 4Dipartimento di Scienze Fisiche e Chimiche, Università dell’Aquila, Coppito-L’Aquila, Italy

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Phys. Rev. Lett. 136, 126502 – Published 25 March, 2026

DOI: https://doi.org/10.1103/ld8v-qpf8

Abstract

We present a dynamical mean-field study of nonperturbative electronic mechanisms, which may lead to significant enhancements of the electron-phonon coupling in correlated electron systems. Analyzing the effects of electronic correlations on the lowest-order electron-phonon processes, we show that in the proximity of the Mott metal-to-insulator transition of the doped square lattice Hubbard model, where the isothermal charge response becomes particularly large at small momenta, the coupling of electrons to the lattice is strongly increased. This, in turn, induces significant corrections to both the electronic self-energy and phonon-mediated pairing interaction, indicating the possible onset of a strong interplay between lattice and electronic degrees of freedom even for small values of the bare electron-phonon coupling.

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Phys. Rev. Lett. 136, 126502– Published 25 March, 2026
  • Received 13 June 2025
  • Revised 20 December 2025
  • Accepted 19 February 2026
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