Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2004-02-03
Physics
Condensed Matter
Soft Condensed Matter
8 pages, 10 figures
Scientific paper
Motivated by the MIT experiment [Gorlitz {\em et al.}, Phys. Rev. Lett. {\bf 87}, 130402 (2001)], we analytically study the effect of density and phase fluctuations on various observables in a quasi one-dimensional degenerate Bose gases. Quantizing the Gross-Pitaevskii Hamiltonian and diagonalize it in terms of the normal modes associated with the density and phase fluctuations of a quasi-one dimensional Bose gas. We calculate dynamic structure factor $S(q,\omega)$ from low-energy condensate density fluctuations and find that there are multiple peaks in $S(q,\omega)$ for a given momentum $q$ due to the discrete energy spectrum. These multiple peaks can be resolved by a two-photon Bragg pulse with a long duration which transfer the momentum to the system. We calculate the momentum transferred $ P_z(t)$ by using the phase-density representation of the Bose order parameter. We also calculate the single-particle density matrix, phase coherence length, and momentum distribution by taking care of the phase fluctuations upto fourth-order term as well as the density fluctuations. Our studies on coherence properties shows that 1D Bose gases of MIT experiment do not form a true condensate, but it can be obtained by a moderate changes of the current experimental parameters.
No associations
LandOfFree
Quasi-one dimensional degenerate Bose gas does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Quasi-one dimensional degenerate Bose gas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quasi-one dimensional degenerate Bose gas will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-546272