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DY: Fachverband Dynamik und Statistische Physik

DY 30: Nonequilibrium Quantum Systems I (joint session TT/DY)

DY 30.11: Vortrag

Mittwoch, 11. März 2026, 12:15–12:30, CHE/0091

Emergent Floquet Fermi Surfaces from Disorder — Inti Sodemann Villadiego, Akihiro Ozawa, and •Felix Frederking — Institut für Theoretische Physik, Universität Leipzig, Brüderstraße 16, 04103 Leipzig, Germany

We investigate the non-equilibrium steady states of periodically driven fermions coupled to a fermionic heat bath and in the presence of disorder (i.e. random impurities). In the absence of disorder, the steady state occupation would be a "stair-case" version of the Fermi-Dirac distribution, which is smooth at finite temperatures. Remarkably, however, we have found that disorder induces non-analyticities in the occupation of states that behave as emergent Fermi surfaces. We will discuss the physical phenomena arising from these non-equilibrium emergent Fermi surfaces and make the case for the feasibility of their detection in ulta-clean 2D materials subjected to low frequency radiation.

Keywords: Floquet; Disorder; Emergent Fermi surfaces; Open Quantum Systems; Non-equilibrium steady states