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  • Letter

Nonequilibrium phononic first-order phase transition in a driven fermion chain

Mohsen Yarmohammadi1,*, Marin Bukov2,†, and Michael H. Kolodrubetz1,‡

  • 1Department of Physics, University of Texas at Dallas, Richardson, Texas 75080, USA
  • 2Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden, Germany

  • *mohsen.yarmohammadi@utdallas.edu
  • †mgbukov@pks.mpg.de
  • ‡mkolodru@utdallas.edu
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Phys. Rev. B 108, L140305 – Published 26 October, 2023

DOI: https://doi.org/10.1103/PhysRevB.108.L140305

Abstract

We study the direct laser drive of infrared-active phonons that are quadratically coupled to a spinless fermion chain. Feedback is incorporated by phonon dressing of the electronic dispersion, which enables effective nonlinearities in the phonon dynamics. We uncover a first-order phase transition in the phononic steady state in which hysteretic effects allow either large or small phonon occupation depending on the drive protocol. We discuss the implications of these findings for probing phase transitions in real driven materials.

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Phys. Rev. B 108, L140305– Published 26 October, 2023
  • Received 1 May 2023
  • Revised 28 September 2023
  • Accepted 16 October 2023
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