Collision of two spin polarized fermionic clouds

Abstract

We study the collision of two spin polarized Fermi clouds in a harmonic trap using a simulation of the Boltzmann equation. As observed in recent experiments we find three distinct regimes of behavior. 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. We thereby demonstrate that all these phenomena can be reproduced using a semiclassical collisional approach and that these changes in behavior are associated with an increasing collision rate. We then show that the oscillation of the clouds in the bounce regime is an example of an unusual case in quantum gases: a nonlinear coupling between collective modes, namely the spin dipole mode and the axial breathing mode which is enforced by collisions. We also determine the frequency of the bounce as a function of the final temperature of the equilibrated system.

updated version, includes 3 animations as supplementary material

References in corpus (5)

• Observation of Anomalous Spin Segregation in a Trapped Fermi Gas
• Spin Transport in Polaronic and Superfluid Fermi Gases
• Spin diffusion in Fermi gases
• Spin Drag in Ultracold Fermi Mixtures with Repulsive Interactions
• Spin transport in coupled spinor Bose gases

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• Numerical solution of the Boltzmann equation for trapped Fermi gases with in-medium effects
• Nonequilibrium dynamics of an ultracold dipolar gas
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• The ground state of polaron in an ultracold dipolar Fermi gas
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• Collisional dynamics of polaronic clouds immersed in a Fermi sea
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• Short-time Spin Dynamics in Strongly Correlated Few-fermion Systems
• Transport of Spin and Mass at Normal-Superfluid Interfaces in the Unitary Fermi Gas
• Inhomogeneous spin diffusion in traps with cold atoms
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• Shock waves in colliding Fermi gases at finite temperature
• Quasi-thermalization of collisionless particles in quadrupole potentials
• Boltzmann equation with double-well potentials