Collision of two spin-polarised atomic Fermi clouds

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• Dr Carlos Lobo, U of Southampton
• Thursday 24 November 2011, 13:45-15:00
• Theory Library.

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

I will discuss our study of recent experiments carried out the in the group of M. Zwierlein at MIT where two fermionic clouds of different spin polarisation collide in a harmonic trap. We are able to simulate this system using a Boltzmann equation approach and observe three distinct behaviour regimes. For weak interactions the clouds pass through each other. If interactions are increased they approach each other exponentially and for strong interactions they bounce off each other several times. I will show that these changes in behavior are associated with an increasing collision rate and will then analyse the oscillation of the clouds in terms of a nonlinear coupling between the spin dipole mode and the axial breathing mode which is enforced by collisions. Finally we are able to determine the frequency of the bounce as a function of the final temperature of the equilibrated system.

This talk is part of the Theoretical Physics Seminars series.

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