Probing strongly interacting atomic gases with energetic atoms

Understand

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.