Quasi one-dimensional Bose–Einstein condensate in a gravito-optical surface trap

2015/09/30 by Javed Akram, Benjamin Girodias, Axel Pelster
Physics and Astronomy · #Ansatz #Cloud computing #Cold Atom Physics and Bose-Einstein Condensates #Dispersion (optics) #Gaussian #Laser #Quantum Electrodynamics and Casimir Effect #Strong Light-Matter Interactions #Wave packet #Work (physics) #cond-mat.quant-gas

paper · pdf · doi:10.1088/0953-4075/49/7/075302

published as Journal of Physics B 49, 075302 (2016)

openalex publication_date 2016/03/17 · arxiv created 2016/03/20 · arxiv updated 2016/04/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We study both static and dynamic properties of a weakly interacting Bose–Einstein condensate (BEC) in a quasi one-dimensional gravito-optical surface trap, where the downward pull of gravity is compensated by the exponentially decaying potential of an evanescent wave. First, we work out approximate solutions of the Gross–Pitaevskii equation for both a small number of atoms using a Gaussian ansatz and a larger number of atoms using the Thomas–Fermi limit. Then we confirm the accuracy of these analytical solutions by comparing them to numerical results. From there, we numerically analyze how the BEC cloud expands non-ballistically, when the confining evanescent laser beam is shut off, showing agreement between our theoretical and previous experimental results. Furthermore, we analyze how the BEC cloud expands non-ballistically due to gravity after switching off the evanescent laser field in the presence of a hard-wall mirror which we model by using a blue-detuned far-off-resonant sheet of light. There we find that the BEC shows significant self-interference patterns for a large number of atoms, whereas for a small number of atoms, a revival of the BEC wave packet with few matter-wave interference patterns is observed.

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