Eur. Phys. J. D 33, 447-451 (2005)
https://doi.org/10.1140/epjd/e2005-00072-2

Bragg spectroscopy of discrete axial quasiparticle modes in a cigar-shaped degenerate Bose gas

The Abdus Salam International Center for Theoretical Physics, Strada Costiera 11, 34014 Trieste, Italy

Corresponding author: ^a tkghosh@mp.okayama-u.ac.jp

Received: 10 December 2004
Revised: 1 February 2005
Published online: 24 May 2005

Abstract

We propose an experiment in which long wavelength discrete axial quasiparticle modes can be imprinted in a 3D cigar-shaped Bose-Einstein condensate by using two-photon Bragg scattering experiments, similar to the experiment at the Weizmann Institute [J. Steinhauer et al., Phys. Rev. Lett. 90, 060404 (2003)] where short wavelength axial phonons with different number of radial modes have been observed. We provide values of the momentum, energy and time duration of the two-photon Bragg pulse and also the two-body interaction strength which are needed in the Bragg scattering experiments in order to observe the long wavelength discrete axial modes. These discrete axial modes can be observed when the system is dilute and the time duration of the Bragg pulse is long enough.