High-temperature quantum oscillations of a nonequilibrium non-Fermi liquid
Phys. Rev. B 114, 074305 – Published 10 August, 2026
DOI: https://doi.org/10.1103/pmsn-5jtp
Abstract
A periodically driven Fermi gas coupled to a simple boson bath reaches a nonequilibrium steady-state occupation with sharp nonanalyticities at certain momenta. Here, we demonstrate that these nonanalyticities behave as emergent Fermi surfaces by showing that they give rise to quantum oscillations of observables with a period controlled by the effective Fermi-surface area enclosed by these nonanalyticities. However, these oscillations have several striking differences with standard equilibrium quantum oscillations. For example, they remain nonanalytic at finite temperatures, their amplitude can survive up to extremely high temperatures comparable to the frequency of the drive, and they can display nonmonotonic temperature dependence completely at odds with standard Lifshitz-Kosevich behavior.
