SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 20: Quantum Gases: Bosons II
Q 20.4: Vortrag
Dienstag, 7. März 2023, 11:45–12:00, F342
Orbital dynamics of bosons in the second Bloch band of an optical lattice — •José Vargas1,2, Marlon Nuske1, Raphael Eichberger1, Carl Hippler1, Ludwig Mathey1,2, and Andreas Hemmerich1,2 — 1Zentrum für Optische Quantentechnologien and Institut für Laser-Physik, Universität Hamburg, 22761 Hamburg, Germany — 2The hamburg center for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany
We explore Josephson-like oscillations of a Bose-Einstein condensate populating the second Bloch band of a bipartite optical square lattice, which provides a double well structure with two inequivalent, degenerate energy minima. An oscillation of the relative population difference between the two energy minima of the second band is observed. The oscillation frequency depends on the ratio of two distinct collisions processes: the on-site collision term of atoms in either of the three local orbitals in shallow and deep wells of the lattice, and a flavour changing collision. The observations are compared to the predictions given by a full quantum model limited to only two single-particle modes neglecting dissipation, which reproduces the measured oscillations and show the correct dependency of the oscillation frequency on the ratio among the strength of the aforementioned collision terms.