Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum gases: Bosons, mixtures and spinor gases
Q 12.1: Vortrag
Montag, 17. März 2014, 14:00–14:15, UDL HS2002
Echo Type Mass Spectroscopy of Impurities Immersed in a Bose Gas — •Tobias Rentrop, Arno Trautmann, Jonas Zeuner, Raphael Scelle, and Markus 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 dynamics of lithium atoms. For this purpose the lithium atoms are confined in a species-selective lattice potential and we investigate the oscillation frequency as a measure of the effective mass. By implementing an echo sequence for the two lowest motional states in the optical lattice, we compensate for the inhomogeneities of the system. Based on this technique, we developed an interferometer type method capable of measuring frequency shifts at the 10−4 level. This precision is necessary for detecting the expected small mass changes due to the weak coupling limit of our system. The observed frequency change indicates an effective mass increase of the lithium atoms on the order of a per mille.