Fort C, Cataliotti F S, Fallani L, Ferlaino F, Maddaloni P, Inguscio M
LENS, Dipartimento di Fisica, Università di Firenze and Istituto Nazionale per la Fisica della Materia, via Nello Carrara 1, I-50019 Sesto Fiorentino (Florence), Italy.
Phys Rev Lett. 2003 Apr 11;90(14):140405. doi: 10.1103/PhysRevLett.90.140405. Epub 2003 Apr 10.
We study low-lying collective modes of an elongated 87Rb condensate produced in a 3D magnetic harmonic trap with the addition of a 1D periodic potential which is provided by a laser standing wave along the axial direction. While the transverse breathing mode remains unperturbed, quadrupole and dipole oscillations along the optical lattice are strongly modified. Precise measurements of the collective mode frequencies at different heights of the optical barriers provide a stringent test of the theoretical model recently introduced [M. Krämer, Phys. Rev. Lett. 88, 180404 (2002)]].
我们研究了在三维磁谐波阱中产生的拉长的87Rb凝聚体的低能集体模式，该凝聚体附加了一个沿轴向由激光驻波提供的一维周期势。虽然横向呼吸模式未受扰动，但沿光学晶格的四极振荡和偶极振荡被强烈改变。对光学势垒不同高度处集体模式频率的精确测量，为最近引入的理论模型[M. 克雷默，《物理评论快报》88, 180404 (2002)]提供了严格检验。
