Phasonic control, dynamical localization and extended critical region using Floquet engineering with ultracold strontium gases

POSTER

Abstract

We report recent experimental studies of dynamics and localization using ultracold strontium atoms in an 1D bichromatic optical lattice. This system realizes the Aubry-André-Harper model, a prototypical tool for the study of localization, pseudo-disorder, and quasicrystals. Driving the phasonic degree of freedom unique to the quasicrystal, we have demonstrated coherent control of Aubry-André localization. Periodically pulsing the secondary optical lattice realizes the hitherto-unexplored kicked Aubry-André-Harper model. To explore the phase diagram of this model as a function of disorder strength and kick period, we developed a Floquet apodization technique. Applying this technique, we observe signatures of an extended critical regime of multifractal wavefunctions.

*We acknowledge support from the Air Force Office of Scientific Research (FA9550-20-1-0240), the Army Research Office (MURI W911NF1710323), the National Science Foundation (CAREER 1555313), the Eddleman Center for Quantum Innovation, the NSF QLCI program through grant number OMA-2016245, and the UCSB NSF Quantum Foundry through the Q-AMASEi program (Grant No. DMR-1906325).

Presenters

  • Yifei Bai

    • University of California, Santa Barbara

Authors

  • Yifei Bai

    • University of California, Santa Barbara

  • Toshihiko Shimasaki

    • University of California, Santa Barbara

  • Hasan E Kondakci

    • University of California, Santa Barbara

  • Peter Dotti

    • University of California, Santa Barbara

  • Jared E Pagett

    • University of California, Santa Barbara
    • University of California Santa Barbara

  • Max Prichard

    • University of California, Santa Barbara
    • Princeton University

  • David M Weld

    • University of California, Santa Barbara
    • UCSB