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

N. Fabbri, D. Clément, L. Fallani, C. Fort, M. Modugno, K. M. R. van der Stam, and M. Inguscio
Phys. Rev. A 79, 043623 – Published 23 April 2009

Abstract

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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  • Received 13 January 2009

DOI:https://doi.org/10.1103/PhysRevA.79.043623

©2009 American Physical Society

Authors & Affiliations

N. Fabbri*, D. Clément, L. Fallani, C. Fort, M. Modugno, K. M. R. van der Stam, and M. Inguscio

  • European Laboratory for Non-linear Spectroscopy (LENS), Dipartimento di Fisica, Università di Firenze and INFM-CNR, via N. Carrara 1, 50019 Sesto Fiorentino (FI), Italy

  • *fabbri@lens.unifi.it

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Issue

Vol. 79, Iss. 4 — April 2009

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