"Hard probes" of strongly interacting atomic gases

Details "Hard probes" of strongly interacting atomic gases "Hard probes" of strongly interacting atomic gases

2011-10-26

arxiv.org/abs/1110.5926v3

Physics

Condensed Matter

Quantum Gases

35 pages, 11 figures; (v3) numerous improvements made

Scientific paper

We investigate properties of an energetic atom propagating through strongly interacting atomic gases. The operator product expansion is used to systematically compute a quasiparticle energy and its scattering rate both in a spin-1/2 Fermi gas and in a spinless Bose gas. Reasonable agreement with recent quantum Monte Carlo simulations even at a relatively small momentum k/kF>1.5 indicates that our large momentum expansions are valid in a wide range of momentum. We also study a differential scattering rate when a probe atom is shot into atomic gases. Because the number density and current density of the target atomic gas contribute to the forward scattering only, its contact density (measure of short-range pair correlation) gives the leading contribution to the backward scattering. Therefore, such an experiment can be used to measure the contact density and thus provides a new local probe of strongly interacting atomic gases.

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