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TT: Fachverband Tiefe Temperaturen

TT 18: Focus Session: Relaxation Timescales in Open Quantum Systems (joint session TT/DY)

TT 18.3: Topical Talk

Montag, 9. März 2026, 16:00–16:30, CHE/0089

Floquet engineering of open quantum Systems — •André Eckardt — Institut für Physik und Astronomie, TU Berlin, Berlin

In recent years, we have seen tremendous progress in the control of quantum systems by means of time-periodic driving. This includes the realization of effective time-independent Hamiltonians with interesting properties, such as artificial magnetic fields coupling to the motion of charge neutral particles in quantum simulators (e.g. of ultracold atoms in optical lattice or photons in superconducting circuits). Also phenomena without equilibrium counterpart, like chiral edge modes connecting Bloch bands with zero Chern number, have been investigated. Another paradigm for the control of quantum systems is reservoir engineering. Here a system is coupled to a controlled environment that is designed to either cool the system or to stabilize a non-equilibrium steady state of interest. I will report on recent theoretical work, where we combine both approaches in open Floquet systems. One motivation is to use dissipation in order to counteract unwanted heating, as it necessarily occurs in Floquet engineered systems, e,.g. for the preparation of Floquet engineered topological states of matter. The other motivation is the stabilization of interesting non-equilibrium steady states beyond the strict constraints of thermal equilibrium. Here I will discuss driving-induced non-equilibrium Bose condensation in high-temperature environments. Finally, I will also briefly address challenges arising when simulating open many-body quantum systems out of equilibrium and ideas how to tackle them.

Keywords: Floquet Engineering; Open Quantum Systems; Quantum Control; Reservoir Engineering