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

Year: 2009

Authors: Fabbri N., Clément D., Fallani L., Fort C., Modugno M., van de Stam K. M. R., Inguscio M.

Autors Affiliation: 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

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.

Journal/Review: PHYSICAL REVIEW A

Volume: 79 (4)      Pages from: 043623  to: 043623

More Information: This work was supported by UE Contract No. RII3-CT2003-506350, MIUR PRIN 2007, and Ente Cassa di Risparmio di Firenze, DQS EuroQUAM Project, NAMEQUAM Project, and Integrated Project SCALA. We acknowledge all the colleagues of the Quantum Degenerate Group at LENS for fruitful comments.
KeyWords: 1D optical lattice; Bose-Einstein condensates; Bragg spectroscopy; Elementary excitations; Excitation spectrum; Experimental investigations; Optical lattices; Periodic potentials; Three-dimensional Bose-Einstein condensate; Transferred momentum, Bose-Einstein condensation; Crystal lattices; Energy transfer; Optical materials; Resonance; Steam condensers, Periodic structures
DOI: 10.1103/PhysRevA.79.043623

Citations: 35
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