Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 4: Ultra-cold atoms, ions and BEC I (with Q)

A 4.1: Vortrag

Montag, 23. März 2015, 14:30–14:45, C/HSW

Matter wave interference of a chiral superfluid — •Wen-Min Huang1,2, Thorge Kock1, Matthias Ölschläger1, Arne Ewerbeck1, Andreas Hemmerich1,2, and Ludwig Mathey1,21Institut für Laserphysik, Universität Hamburg, 22761 Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, Hamburg 22761, Germany

In a recent experiment[1], ultracold atoms were loaded into the second band of an optical lattice, and the resulting chiral superfluid order, that these atoms formed, were revealed by matter wave heterodyning technique: two independent, but coherent, condensates were created, then brought to interference in the time-of-flight expansion. Two classes of interference patterns are observed, and may be attributed to the same or the opposite chiral order spontaneously developed in two independent subsystems. In this work, we construct the interference contrast by computing the convolution of the Green's functions of the two condensates. We confirm that while the same chiral symmetry are developed in the two subsystems, the interference contrast between the two momenta at while the atoms are condensed is correlative. In contrast, if two opposite chiral symmetries are developed, an anti-correlative interference pattern is presented. Our simulations agree with the experimental observation and provide an unambiguous demonstration of two chiral time-reversal symmetry breaking superfluid order. ------ [1] T. Kock, M. Ölschläger, A. Ewerbeck, W.-M. Huang, L. Mathey and A. Hemmerich, arXiv:1411.3483

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