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  • Letter
  • Open Access

Anomalously long lifetimes in two-dimensional Fermi liquids

Johannes Hofmann1,* and Ulf Gran2,†

  • 1Department of Physics, Gothenburg University, 41296 Gothenburg, Sweden
  • 2Department of Physics, Chalmers University of Technology, 41296 Gothenburg, Sweden

  • *johannes.hofmann@physics.gu.se
  • †ulf.gran@chalmers.se
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Phys. Rev. B 108, L121401 – Published 5 September, 2023

DOI: https://doi.org/10.1103/PhysRevB.108.L121401

Abstract

A precise characterization of the recently discovered crossover to hydrodynamic transport in electron liquids, and in particular of a conjectured exotic odd-parity transport regime, requires a full solution of the Fermi-liquid collision integral at all temperatures beyond state-of-the-art analytic leading-logarithmic approximations. We develop a general basis expansion of the linearized collision integral applicable at all temperatures, and employ this to determine the decay rates of Fermi surface perturbations in two-dimensional electron liquids. In particular, we provide exhaustive data on the decay rates for a new odd-parity regime, in which parity-even Fermi surface deformations decay rapidly but odd-parity modes are anomalously longlived. We find that this transport regime exists at fairly large temperatures T≲0.1TF, putting this regime within the reach of current experiments.

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Phys. Rev. B 108, L121401– Published 5 September, 2023
  • Received 7 November 2022
  • Accepted 10 August 2023
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