Peak in the static structure factor of a Bose-Einstein condensate (5 pages)

Pietro Massignan, C. J. Pethick

András Sütö

S. Giovanazzi

H. L. Haroutyunyan

Jeff Steinhauer, Roee Ozeri, Nadav Y. Katz +1 more

A peak in the static structure factor of a Bose-Einstein condensate is computed, both near and far from a Feshbach resonance. A low-density approximation is made, allowing for an analytic result. A Monte Carlo calculation shows that the peak is larger than predicted by the low-density approximation, for the upper range of densities considered here. The peak could be measured by a probe beam of cold atoms.

L. M. Symes, D. Baillie, P. B. Blakie

We consider the total density and spin density fluctuations of a uniform spin-1 Bose-Einstein condensate within the Bogoliubov formalism. We present results for the total density and spin density static structure factors for all four magnetic phases. A key result of our work is a set of analytic predictions for the structure factors in the large- and small-momentum limits. These results will be useful in current experiments aiming to develop a better understanding of the excitations and fluctuations of spinor condensates.