Hamburg 2009 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster IV

Q 56.4: Poster

Thursday, March 5, 2009, 16:30–19:00, VMP 9 Poster

Phase slips as fluctuating dark solitons in a quasi-one-dimensional BEC — •Philip Walczak and James Anglin — Fachbereich Physik, TU Kaiserslautern, D-67663 Kaiserslautern

In interferometry experiments with quasi-one-dimensional Bose-condensed gases one can observe local shifts in the interference pattern which are due to thermal phase fluctuations of the condensates [1]. In the semi-classical limit, large phase slips can occur on healing length scales through the formation of so-called grey solitons. Using a path integral with canonical collective co-ordinates for a grey soliton, we compute probabilities for phase slips as quantum and thermal fluctuations. We include Brownian motion of the soliton due to back reaction on the soliton co-ordinates from the Bogoliubov modes of the quasi-one-dimensional dilute Bose gas.

[1] J. Schmiedmayer et al., Nature 449, 324-328 (2007)