Dynamic structure factor of a Bose-Einstein condensate in a one-dimensional optical lattice

Year: 2003

Authors: Menotti C., Kramer M., Pitaevskii L., Stringari S.

Autors Affiliation: Univ Trent, Dipartimento Fis, I-38050 Povo, Italy; INFM, BEC, I-38050 Povo, Italy; Univ Cattolica Sacro Cuore, Dipartimento Matemat & Fis, I-25121 Brescia, Italy; Kapitza Inst Phys Problems, Moscow 117334, Russia.

Abstract: We study the effect of a one-dimensional periodic potential on the dynamic structure factor of an interacting Bose-Einstein condensate at zero temperature. We show that, due to phononic correlations, the excitation strength toward the first band develops a typical oscillating behavior as a function of the momentum transfer, and vanishes at even multiples of the Bragg momentum. The effects of interactions on the static structure factor are found to be significantly amplified by the presence of the optical potential. Our predictions can be tested in stimulated photon scattering experiments.

Journal/Review: PHYSICAL REVIEW A

Volume: 67 (5)      Pages from: 53609-1  to: 53609-4

KeyWords: Gas
DOI: 10.1103/PhysRevA.67.053609

Citations: 49
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