Characteristics of Bose-Einstein condensation in an optical lattice

Physical Review A - Atomic, Molecular, and Optical Physics

Volumn 77, Issue 4, 2008, Pages

  Lin, G D ^a   Zhang, Wei ^a   Duan, L M ^a  

^a UNIVERSITY OF MICHIGAN   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

IMAGING SYSTEMS; MODAL ANALYSIS; THERMOMETERS; WAVE INTERFERENCE;

BEC TRANSITION TEMPERATURE; BRILLOUIN ZONE; OPTICAL LATTICE;

BOSE-EINSTEIN CONDENSATION;

EID: 42549134842     PISSN: 10502947     EISSN: 10941622     Source Type: Journal    
DOI: 10.1103/PhysRevA.77.043626     Document Type: Article

References (19)

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19. In this paper, we have assumed that the expansion time is long enough so that the final absorption image represents the initial momentum distribution (the far-field limit). In real experiments, the expansion time may not be long enough to achieve this far-field limit [I. Bloch (private communication)]. This leads to some effective momentum broadening effect seen in observation, which looks similar to the momentum broadening caused by the atomic interaction. However, these two effects should be distinguished. According to the calculation here, the interaction induced momentum broadening is actually not significant for a condensate with a moderate density (such as about one atom per site). The effective broadening effect seen in observation caused by the finite expansion time, in principle, can be undone theoretically if one knows the initial condensate profile and the expansion time.