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Q: Fachverband Quantenoptik und Photonik

Q 31: Quantum gases: Optical lattices I

Q 31.3: Vortrag

Dienstag, 19. März 2013, 14:45–15:00, E 001

Motional coherence of fermions immersed in a bosonic bath — •Raphael Scelle, Arno Trautmann, Tobias Rentrop, and Markus K. Oberthaler — Kirchhoff-Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg

We study the impact of a Bose Einstein condensate of sodium atoms on the motional coherence of lithium atoms. For this purpose the lithium atoms are exposed to a species-selective lattice potential which allows to prepare the lithium atoms in a motionally coherent state by control of the lattice position. We developed a spin echo technique in order to investigate the bath impact on the coherent evolution of the lithium atoms. The interaction between the two components induces a decay of the motional coherence and we extract the corresponding time scale by comparing the spin echo signal for freely evolving lithium atoms to the signal for atoms evolving within the bosonic bath. The observed coherence decay time is consistent with the time scale expected from relaxation measurements of motionally excited states.