Dynamics of trapped dipolar condensates

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• Mattia Jona Lasinio (Hanover)
• Wednesday 22 August 2012, 13:00-14:00
• Physics East 217.

If you have a question about this talk, please contact Vincent Boyer.

The tunability of the scattering properties, offered by the Feshbach resonance mechanism, makes ultracold gases an optimal system where dipolar interactions can be investigated. The interest in the dipole-dipole interaction in atomic systems derives from it being both anisotropic and long range. The combination of these two features leads to fundamental differences, as compared to the usual short range isotropic interaction, when it comes to the stability of the system (stabilization of a condensate with attractive interactions), the behavior during collapse and Time-of-flight expansion and the presence of a roton-maxon in the excitation spectrum.

In particular I will present recent theoretical results on the stability, the collapse and the Time-of-flight expansion of a dipolar condensate as well as its experimental investigation in Chromium.

Future efforts will be devoted to the experimental observation of the, still elusive, roton behavior in dipolar condensates. In this respect the recent achievement of condensation of Erbium sounds promising. I will discuss how vortices in dipolar condensates can be employed as a detection method of the roton behavior and how one can create trapped “rotons” on top of a dipolar condensate as if they were real particles.

This talk is part of the Cold Atoms series.

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• Bham Talks
• Cold Atoms
• Physics East 217
• What's on in Physics?

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