Observation of collective atomic recoil motion in a momentum-squeezed, ultra-cold, degenerate fermion gas

Details Observation of collective atomic recoil motion in a momentum-squeezed, ultra-cold, degenerate fermion gas Observation of collective atomic recoil motion in a momentum-squeezed, ultra-cold, degenerate fermion gas

2010-06-16

arxiv.org/abs/1006.3250v2

Physics

Condensed Matter

Quantum Gases

Scientific paper

We demonstrate clear collective atomic recoil motion in a dilute, momentum-squeezed, ultra-cold degenerate fermion gas by circumventing the effects of Pauli blocking. Although gain from bosonic stimulation is necessarily absent because the quantum gas obeys Fermi-Dirac statistics, collective atomic recoil motion from the underlying wave-mixing process is clearly visible. With a single pump pulse of the proper polarization, we observe two mutually-perpendicular wave-mixing processes occurring simultaneously. Our experiments also indicate that the red-blue pump detuning asymmetry observed with Bose-Einstein condensates does not occur with fermions.

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