Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 22: Ultracold Matter (Bosons) II (joint session Q/A)
Q 22.4: Vortrag
Dienstag, 11. März 2025, 11:45–12:00, HS I PI
Observation of localization in quasidisordered optical lattices — •David Gröters1, 2, Lee Reeve1, Zhuoxian Ou1, Qijun Wu1, Emmanuel Gottlob1, Yong-Guang Zheng1, Bo Song1, and Ulrich Schneider1 — 1Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom — 2Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
Quasidisordered materials constitute a unique class of systems that are not periodic yet long-range ordered. They can exhibit localized phases of matter, known as the Bose glass, in which thermalization and transport are inhibited. While the Bose glass has recently been observed, an understanding of how localization prevents transport in quasicrystals in the presence of interactions remains unclear.
In this talk, we present recent results of our optical lattice-based quantum simulator on localization of interacting 39K atoms in 2D. We directly observe a suppression in transport rate by three orders of magnitude in a quasicrystal potential that we compare to numerical exact-diagonalization results. Furthermore, we investigate the quasiperiodic Aubry-André model in which transport characteristics are expected to be strikingly different. Using coherence measurements, we map the disorder vs. interaction strength phase diagram and find signatures of the Bose glass phase. Our results demonstrate robust localization in quasicrystalline lattices in the presence of interactions that renders these systems a valuable platform for future studies of many-body localization.
Keywords: Localization; Quasicrystal; Aubry-André model; Optical lattices; Quantum Simulation