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Finite Temperature Properties of Fluctuating Atomic (quasi) Condensates

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  • UserDr Nikalaous Proukakis, U of Newcasstle
  • ClockThursday 18 November 2010, 13:45-15:00
  • HouseTheory Library.

If you have a question about this talk, please contact Dr Dimitri M Gangardt.

Ultracold gases are interesting in low dimensional geometries, both due to their potential applications, and due to the enhancement of the role of critical fluctuations. Phase and density fluctuations decouple in quasi-one-dimensional settings, leading to a richer pahse diagram and a more involved theoretical description at intermediate temperatures. In this talk, I will focus mainly on one approach for describing such systems, known as the Stochastic Gross-Pitaevskii equation. At equilibrium, the predictions of this theory will be compared both to a number of alternative theories and to experiments with quasi-one-dimensional weakly-interacting gases, thereby revealing its predictive power. Moreover, the stochastic nature of this equation is ideal for capturing shot-to-shot variations seen in experiments; in probing non-equilibrium issues, a study of dark soliton dynamics will be shown to produce a distribution of decay times, and variations between individual trajectories. Potential limitations of this approach, and possible remedies will also be discussed.

This talk is part of the Theoretical Physics Seminars series.

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