Collisions in zero temperature Fermi gases

Details Collisions in zero temperature Fermi gases Collisions in zero temperature Fermi gases

2003-07-03

arxiv.org/abs/cond-mat/0307088v1

Phys.Rev.Lett.92:100401,2004

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.92.100401

We examine the collisional behavior of two-component Fermi gases released at zero temperature from a harmonic trap. Using a phase-space formalism to calculate the collision rate during expansion, we find that Pauli blocking plays only a minor role for momentum changing collisions. As a result, for a large scattering cross-section, Pauli blocking will not prevent the gas from entering the collisionally hydrodynamic regime. In contrast to the bosonic case, hydrodynamic expansion at very low temperatures is therefore not evidence for fermionic superfluidity.

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