Observation of phase fluctuations in elongated bose-einstein condensates

Dettmer, S.; Hellweg, D.; Ryytty, P.; Arlt, Jan J.; Ertmer, Wolfgang; Sengstock, K.; Petrov, D.S.; Shlyapnikov, G.V.; Kreutzmann, H.; Santos, Luis; Lewenstein, M.

Original version

Dettmer, S.; Hellweg, D.; Ryytty, P.; Arlt, J.J.; Ertmer, W. et al.: Observation of phase fluctuations in elongated bose-einstein condensates. In: Physical Review Letters 87 (2001), Nr. 16, 160406. DOI: https://doi.org/10.1103/PhysRevLett.87.160406

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Abstract:
The occurrence of phase fluctuations due to thermal excitations in Bose-Einstein condensates (BECs) is studied for a variety of temperatures and trap geometries. We observe the statistical nature of the appearance of phase fluctuations and characterize the dependence of their average value on temperature, number of particles, and the trapping potential. We find pronounced phase fluctuations for condensates in very elongated traps in a broad temperature range. The results are of great importance for the realization of BEC in quasi-1D geometries, for matter wave interferometry with BECs, as well as for coherence properties of guided atom laser beams. © 2001 American Physical Society.
License of this version:	Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
Publication type:	Article
Publishing status:	publishedVersion
Publication date:	2001
Keywords english:	Atoms, Computer simulation, Interferometry, Laser beams, Polynomials, Quantum theory, Rubidium, Temperature, Bose Einstein condensates, Guided atom laser beams, Magnetic trap, Phase coherence, Phase fluctuations, Thermal excitations, Electron gas
DDC:	530 \| Physik