BPCPPDYSOE21 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 19: Statistical Physics 4 - organized by Barbara Drossel (Darmstadt), Sabine Klapp (Berlin) and Thomas Speck (Mainz)

DY 19.3: Vortrag

Dienstag, 23. März 2021, 09:40–10:00, DYb

Fermionic Criticality Out-of-Equilibrium — •Bernhard Frank and Francesco Piazza — Max-Planck-Institut für Physik komplexer Systeme, Dresden, Germany

Coupling critical bosons to a Fermi surface provides a standard route for the formation of a non-Fermi liquid: Its correlation functions do not show features of Landau quasiparticles but exhibit anomalous power laws, which give rise to substantial deviations from Fermi liquid results. So far these systems have been extensively studied in thermal equilibrium, for instance in the context of strange metals. However, recent experiments combine semi-conductor devices with optical cavities and therefore mandatorily require a theoretical formulation that takes into account the intrinsically open nature of the photonic sector in order to understand the electronic many-body physics. In particular, associating the photon with the critical bosonic mode leads to non-Fermi liquids out-of-equilibrium. Here, we use Keldysh field theory to study the paradigmatic Ising-nematic model in two-dimensions within a simple driven-dissipative setup. Compared to the situation in the ground state one observes increased decay rates in the low-energy sector of the fermionic spectrum as well as a violation of the thermal fluctuation dissipation relation caused by the enhanced bosonic fluctuations generated by the drive.