Bragg spectroscopy of the multi-branch Bogoliubov spectrum of elongated Bose-Einstein condensates

Author

Steihhauer, Jeff ; Katz, Nadav ; Ozeri, Roee ; Davidson, Nir ; Tozzo, Cesare ; Dalfovo, Franco

Author_Institution

Dept. of Phys. of Complex Syst., Weizmann Inst. of Sci., Israel

fYear

2003

fDate

22-27 June 2003

Firstpage

185

Abstract

This paper presents Bragg spectroscopy of the multi-branch Bogoliubov spectrum of elongated Bose-Einstein condensates. The condensate consists of N=10⁵ atoms of ⁸⁷Rb which was excited at wavenumber k by using two Bragg beams. Results are analyzed by numerically solving the Gross-Pitaevskii (GP) equation for the order parameter of the condensate. This study shows that the response of the condensate to a Bragg pulse is indeed significantly affected by the radial degrees of freedom. By using Bragg pulses longer than in previous measurements, this multi-branch spectrum is resolved, finding good agreement with the predictions of Gross-Pitaevskii theory.

Keywords

Bose-Einstein condensation; density functional theory; excited states; rubidium; two-photon spectra; ⁸⁷Rb atoms; Bogoliubov spectrum; Bose-Einstein condensates; Bragg beams; Bragg pulse; Bragg spectroscopy; Gross-Pitaevskii equation; Gross-Pitaevskii theory; Rb; local density approximation; multibranch spectrum; Atomic measurements; Equations; Frequency; Gases; Linear discriminant analysis; Physics; Pulse measurements; Scattering; Solids; Spectroscopy;

fLanguage

English

Publisher

ieee

Conference_Titel

Quantum Electronics Conference, 2003. EQEC '03. European

Print_ISBN

0-7803-7733-8

Type

conf

DOI

10.1109/EQEC.2003.1314042

Filename

1314042