Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 34: Quantum gases (Fermions) II
Q 34.4: Talk
Wednesday, March 11, 2020, 15:00–15:15, e214
Ergodicity-breaking in tilted 1D optical lattices — •Sebastian Scherg1,2,3, Thomas Kohlert1,2,3, 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 without the presence of disorder. Using a superlattice to create an initial charge-density wave, we measure the population imbalance between even and odd sites. 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 harmonic confinement in the non-interacting regime. 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.