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- W1515737928 abstract "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." @default.
- W1515737928 created "2016-06-24" @default.
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- W1515737928 date "2008-01-01" @default.
- W1515737928 modified "2023-09-27" @default.
- W1515737928 title "Quasi-one dimensional degenerate Bose gases" @default.
- W1515737928 hasPublicationYear "2008" @default.
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