Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 20: Quantum Gases: Bosons III
Q 20.5: Talk
Tuesday, March 24, 2015, 12:00–12:15, P/H2
Observation of chiral superfluid order by matter wave heterodyning — •Thorge Kock1, Arne Ewerbeck1, Carl Hippler1, Matthias Ölschläger1, Wen-Min Huang1,2, Ludwig Mathey1,2, and Andreas Hemmerich1,2 — 1Institut für Laser-Physik, Universität Hamburg — 2The Hamburg Centre for Ultrafast Imaging
We present a demonstration of time reversal symmetry breaking for atoms Bose- Einstein condensed in the second Bloch band of a bipartite optical square lattice. A double layer chiral superfluid is formed after splitting the condensate with a blue-detuned laser beam. In a ballistic expansion process the two layers are superimposed and imaged after 25 ms time of flight. The Bragg maxima thus observed exhibit interference patterns, which provide direct information on the formation of chiral order and the presence and character of low energy excitations.