The effects of quantum and thermal fluctuations upon the fringe structure predicted to be observable in the momentum distribution of coupled Bose-Einstein condensates are studied by the effective-potential method. For a double-well trap, the coherence factor recently introduced by Pitaevskii and Stringari (e-print cond-mat/0104458) is calculated using the effective potential approach and is found in good agreement with their result. The calculations are extended to the case of a one-dimensional array of condensates, showing that quantum effects are essentially described through a simple renormalization of the energy scale in the classical analytical expression for the fringe structure. The consequences for the experimental observability are discussed.
Quantum fluctuations in one-dimensional arrays of condensates / A. CUCCOLI; A. FUBINI; V. TOGNETTI; R. VAIA. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - STAMPA. - 64:(2001), pp. 061601:1-061601:4. [10.1103/PhysRevA.64.061601]
Quantum fluctuations in one-dimensional arrays of condensates
CUCCOLI, ALESSANDRO;FUBINI, ANDREA;TOGNETTI, VALERIO;
2001
Abstract
The effects of quantum and thermal fluctuations upon the fringe structure predicted to be observable in the momentum distribution of coupled Bose-Einstein condensates are studied by the effective-potential method. For a double-well trap, the coherence factor recently introduced by Pitaevskii and Stringari (e-print cond-mat/0104458) is calculated using the effective potential approach and is found in good agreement with their result. The calculations are extended to the case of a one-dimensional array of condensates, showing that quantum effects are essentially described through a simple renormalization of the energy scale in the classical analytical expression for the fringe structure. The consequences for the experimental observability are discussed.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.