Local atom-number fluctuations in quantum gases at finite temperature

Journal Article · Thu Sep 15 00:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.033612· OSTI ID:22068757

Klawunn, M; Recati, A; Stringari, S ^[1]; Pitaevskii, L P ^[1]

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1. INO-CNR BEC Center and Dipartimento di Fisica, Universita di Trento, I-38123 Povo (Italy)

We investigate the number fluctuations in small cells of quantum gases pointing out important deviations from the thermodynamic limit fixed by the isothermal compressibility. Both quantum and thermal fluctuations in weakly as well as highly compressible fluids are considered. For the two-dimensional (2D) superfluid Bose gas we find a significant quenching of fluctuations with respect to the thermodynamic limit, in agreement with recent experimental findings. An enhancement of the thermal fluctuations is instead predicted for the 2D dipolar superfluid Bose gas, which becomes dramatic when the size of the sample cell is of the order of the wavelength of the rotonic excitation induced by the interaction.

• OSTI ID: 22068757
• Journal Information: Physical Review. A, Vol. 84, Issue 3; Other Information: (c) 2011 American Institute of Physics; Country of input: Syrian Arab Republic; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
BOSE-EINSTEIN GAS
COMPRESSIBILITY
EXCITATION
FLUCTUATIONS
GASES
INTERACTIONS
QUENCHING
SUPERFLUIDITY
TWO-DIMENSIONAL CALCULATIONS
WAVELENGTHS