|Probing Sound Speed of an Optically-Trapped Bose Gas with Periodically Modulated Interactions by Bragg Spectroscopy|
|L. Chen; W. Li; Z. Chen; Z. D. Zhang; Z. X. Liang
|Source Publication||Journal of Low Temperature Physics
|Abstract||A Bose-Einstein condensate (BEC) with periodically modulated interactions (PMI) has emerged as a novel kind of periodic superfluid, which has been recently experimentally created using optical Feshbach resonance. In this paper, we are motivated to investigate the superfluidity of a BEC with PMI trapped in an optical lattice (OL). In particular, we explore the effects of PMI on the sound speed and the dynamical structure factor of the model system. Our numerical results, combined with the analytical results in both the weak-potential limit and the tight-binding limit, have shown that the PMI can strongly modify the sound speed of a BEC. Moreover, we have shown that the effects of PMI on the sound speed can be experimentally probed via the dynamic structure factor, where the excitation strength toward the first Bogoliubov band exhibits a marked difference from the non-PMI one. Our predictions of the effects of PMI on the sound speed can be tested using the Bragg spectroscopy.|
; li, wu
; zhang, zhidong
; liang, zhaoxin] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [chen, zhu] inst appl phys & computat math, natl key lab sci & technol computat phys, beijing 100088, peoples r china.
; liang, zx (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, wenhua rd 72, shenyang 110016, peoples r china.
Dynamic Structure Factor
L. Chen,W. Li,Z. Chen,et al. Probing Sound Speed of an Optically-Trapped Bose Gas with Periodically Modulated Interactions by Bragg Spectroscopy[J]. Journal of Low Temperature Physics,2014,177(5-6):291-304.
L. Chen,W. Li,Z. Chen,Z. D. Zhang,&Z. X. Liang.(2014).Probing Sound Speed of an Optically-Trapped Bose Gas with Periodically Modulated Interactions by Bragg Spectroscopy.Journal of Low Temperature Physics,177(5-6),291-304.
L. Chen,et al."Probing Sound Speed of an Optically-Trapped Bose Gas with Periodically Modulated Interactions by Bragg Spectroscopy".Journal of Low Temperature Physics 177.5-6(2014):291-304.
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