Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 50: Quantum Gases (Bosons) V
Q 50.5: Vortrag
Mittwoch, 7. März 2018, 15:00–15:15, K 2.020
Al'tshuler-Aronov-Spivak oscillations of coherent bosonic matter-wave beams in the presence of interaction — •Renaud Chrétien1, Josef Rammensee2, Cyril Petitjean1, and Peter Schlagheck1 — 1CESAM research unit, University of Liege, 4000 Liège, Belgium — 2Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany
We theoretically study the propagation of a guided atom laser across an Aharonov-Bohm ring exposed to a synthetic gauge field. The presence of disorder within the ring gives rise to Al'tshuler-Aronov-Spivak oscillations [1], seen in the disorder-averaged transmission as a function of the effective gauge flux that is contained within the ring. Those oscillations are induced by coherent backscattering and represent a manifestation of weak localization. Through analytical and numerical calculations based on the mean-field Gross-Pitaevskii approximation for the propagating Bose-Einstein condensate, we show that the presence of a weak atom-atom interaction within the ring leads to an inversion of the AAS oscillations, in a very similar manner as for the coherent backscattering of Bose-Einstein condensates within two-dimensional disorder potentials [2]. Truncated Wigner simulations reveal that this signature of weak antilocalization becomes washed out if the interaction strength is increased, which is in qualitative agreement with the findings of the diagrammatic study undertaken in Ref. [3].
[1] B. L. Al'tshuler, et. al., JETP Lett. 33, 94 (1981).
[2] M. Hartung, et. al., PRL. 101, 020603 (2008).
[3] T. Geiger, et. al., New J. Phys. 15, 115015 (2013).