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Q: Fachverband Quantenoptik und Photonik
Q 22: Posters: Quantum Optics and Photonics II
Q 22.59: Poster
Dienstag, 10. März 2020, 16:30–18:30, Empore Lichthof
Ergodicity breaking in tilted one-dimensional optical lattices — •Thomas Kohlert1,2,3, Sebastian Scherg1,2,3, Bharath Hebbe Madhusudhana1,2,3, Immanuel Bloch1,2,3, and Monika Aidelsburger1,2 — 1Ludwig-Maximilians-Universität, Schellingstr. 4, 80799 München, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, 80799 München, Germany — 3Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany
We study interacting ultracold Fermions in a tilted 1D optical lattice to investigate how non-ergodic dynamics can emerge in a system even in the absence of disorder. Using a superlattice to create an initial charge-density wave, we measure the population imbalance between even and odd sites as a local probe of localization. At short times, we observe spin-resolved and parity-projected real-space Bloch oscillations, which are used as benchmark for the experimental parameters such as tunneling rate, tilt and external harmonic confinement in the single-particle case. In the presence of interactions we observe an interaction-dependent amplitude modulation and dephasing of the Bloch oscillations. The long-time dynamics reveal a robust steady state imbalance over about 300 tunneling times, whose value depends on the interaction strength. Finally, we couple adjacent 1D systems to probe the crossover from a non-ergodic 1D to an ergodic 2D system and find a decay of the imbalance depending on the transverse coupling strength.