The 27th International Conference on Atomic Physics

Observation of interaction-driven delocalization of the Anderson insulator in synthetic dimensions

Jul 21, 2022, 5:00 PM

1h 30m

Hart House (Hart House)

Poster presentation Degenerate gases, many-body physics, and quantum simulation Poster session

Speaker

Jun Hui See Toh (University of Washington, Seattle)

Description

The quantum kicked rotor is a paradigm system to study classical and quantum chaos. When viewed in momentum space, it is equivalent to the Anderson model of transport in the presence of disorder, featuring dynamical localization in the synthetic momentum space. We report the observation of interaction-driven delocalization in d-dimensional (d=1-4) Anderson models in the synthetic momentum space. Higher dimensions are generated by amplitude modulating the kick pulses of the quantum kicked rotor, and interactions are controlled via the transverse confinement of the 1D tubes. We show that interaction destroys dynamical localization for d=1-4, and the dynamics of the system becomes sub-diffusive. We also observed the onset of delocalization to start earlier with stronger interaction, modulation, and kick. Compared to earlier experimental studies in position space, our approach addresses interaction-driven transport in the Anderson model in great than 1 dimension and with infinitely-long range interactions realized in momentum space.