Excitations of Bose-Einstein condensates in a one-dimensional periodic potential

被引：37
作者：
Fabbri, N. [1 ]
Clement, D.
Fallani, L.
Fort, C.
Modugno, M.
van der Stam, K. M. R.
Inguscio, M.
机构：
[1] Univ Florence, European Lab Nonlinear Spect LENS, Dipartimento Fis, I-50019 Sesto Fiorentino, FI, Italy
来源：
PHYSICAL REVIEW A | 2009年 / 79卷 / 04期
关键词：
band structure; Bose-Einstein condensation; optical lattices;
D O I：
10.1103/PhysRevA.79.043623
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We report on the experimental investigation of the response of a three-dimensional Bose-Einstein condensate (BEC) in the presence of a one-dimensional (1D) optical lattice. By means of Bragg spectroscopy we probe the band structure of the excitation spectrum in the presence of the periodic potential. We selectively induce elementary excitations of the BEC choosing the transferred momentum and we observe different resonances in the energy transfer, corresponding to the transitions to different bands. The frequency, the width, and the strength of these resonances are investigated as functions of the amplitude of the 1D optical lattice.
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