In this talk, I will report on two sets of experiments.  In the first, starting from 2-nK samples in a compensated flat-bottom optical trap, we observe many-body dynamical localization in a 1D quantum under quantum kicked rotor (QKR) setting [1] as the interactions are tuned from zero into the Tonks-Girardeau (TG) regime. After some initial evolution, the momentum distribution freezes and retains its characteristic structure as the sample is kicked periodically hundreds of times. In contrast, for random kicking, the distribution becomes uniform and loses all structure.

In the second set of experiments, we study impurity transport for strongly interacting impurity atoms through fermionized bosons. We measure the momentum relaxation time as we vary the initial momentum and the interaction strength for abruptly “injected” impurities. For adiabatic following of the ground state we find that smoothly moving impurities develop anyonic properties. We have observed that the momentum distribution of impurities changes from bosonic to fermionic, as the mean momentum varies from zero to Fermi momentum for the fermionized gas.

[1] Observation of many-body dynamical localization, Y. Guo et al., arXiv:2312.13880 (2023)

邀请人

石弢 研究员