The Roton in a Bose-Einstein Condensate

J. Steinhauer, R. Ozeri, N. Davidson

The roton in a Bose-Einstein condensate is computed, particularly near a Feshbach resonance. A low-density approximation is made, allowing for an analytic result in the low-density limit. A Monte Carlo calculation shows that the low-density approximation is valid for a significant range of densities. The low-density approximation is applied to superfluid 4He, roughly reproducing the results of previous Monte Carlo calculations.

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