SAMOP 2021 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 8: Quantum Information: Poster (joint session QI/Q)
QI 8.4: Poster
Mittwoch, 22. September 2021, 16:30–18:30, P
Experimental exploration of fragmented models and non-ergodicity in tilted Fermi-Hubbard chains — •Clara Bachorz1, Sebastian Scherg1, 2, Thomas Kohlert1, 2, Pablo Sala3, Frank Pollmann3, Bharath Hebbe Madhusudhana1, 2, Immanuel Bloch1, 2, and Monika Aidelsburger1 — 1LMU Munich, Germany — 2Max-Planck institut fur Quantenoptik, Garching, Germany — 3TUM Munich, Germany
Thermalization of isolated quantum many-body systems is deeply related to redistribution of quantum information in the system. A question of fundamental importance is when do quantum many-body systems fail to thermalize, i.e., feature non-ergodicity. A test-bed for the study of non-ergodicity is the tilted Fermi-Hubbard model, which is directly accessible in experiments with ultracold atoms in optical lattices. Here we experimentally study non-ergodic behavior in this model by tracking the evolution of an initial charge-density wave [1]. In the limit of large tilts, we identify the microscopic processes which the observed dynamics arise from. These processes constitute an effective Hamiltonian and we experimentally show its validity [2]. This effective Hamiltonian features the novel phenomenon of Hilbert space fragmentation. For intermediate tilts, while these effective models are no longer valid, we show that the features of fragmentation are still vaguely present in the dynamics. Finally, we explore the relaxation dynamics of the imbalance in a 2D tilted Fermi-Hubbard system.
[1.] Sebastian Scherg et al. arXiv:2010.12965
[2.] Thomas Kohlert et al. arXiv:2106.15586