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TT: Fachverband Tiefe Temperaturen

TT 29: Nonequilibrium Quantum Many-Body Systems 2 (joint session TT/DY)

TT 29.1: Vortrag

Dienstag, 17. März 2020, 14:00–14:15, HSZ 204

Robust and ultrafast state preparation by ramping artificial gauge potentials — •Botao Wang, Xiaoyu Dong, F. Nur Ünal, and André Eckardt — Max-Planck-Institut für Physik komplexer Systeme Nöthnitzer Str. 38, D-01387 Dresden, Germany

The implementation of static artificial magnetic fields in ultracold atomic systems has been established as a powerful tool, e.g. for simulating quantum-Hall physics with charge-neutral atoms. Taking an interacting bosonic flux ladder as a minimal model, we investigate protocols for adiabatic state preparation based on ramping up the vector potential (in the form of Peierls phases), which is engineered to give rise to the desired magnetic flux. We find that the time required for adiabatic state preparation dramatically depends on the spatial pattern of Peierls phases used to create the flux. This is explained by the fact that, while different patterns (i.e. vector potentials) just correspond to different gauges for static fluxes, they induce different electric fields during the ramp. Remarkably, we find that for an optimal choice, it allows for preparing the ground state almost instantaneously. This provides a novel concept for shortcuts to adiabaticity and may open up a new way for robust state preparation.