E the excitation in the trapped condensate 12chapter

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Unformatted text preview: re then imaged by resonant absorption imaging (Fig. 1). Bragg scattered atoms were distinguished from the unscattered atoms by their axial displacement. The speed of Bogoliubov sound at the center of the trapped condensate is related to the velocity of radial expansion yr as cs p 11 mm s at m h 6.7 kHz as shown yr 2 [11] (cs in Fig. 1). Thus, by comparing the axial displacement of the scattered atoms to the radial extent of the expanded FIG. 2. Bragg scattering of phonons and of free particle condensate, one sees that the Bragg scattering recoil veMomentum transfer per particle, in units of hq, is shown ¯ locity is smaller than the speed of sound in the trapped the frequency difference v 2p between t...
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This document was uploaded on 02/27/2014 for the course PHYS 284 at Harvard.

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