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Title: Local atom-number fluctuations in quantum gases at finite temperature

Abstract

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.

Authors:
; ;  [1];  [1];  [2]
  1. INO-CNR BEC Center and Dipartimento di Fisica, Universita di Trento, I-38123 Povo (Italy)
  2. (Russian Federation)
Publication Date:
OSTI Identifier:
22068757
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 84; Journal Issue: 3; Other Information: (c) 2011 American Institute of Physics; Country of input: Syrian Arab Republic; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Klawunn, M., Recati, A., Stringari, S., Pitaevskii, L. P., and Kapitza Institute for Physical Problems, Russian Academy of Science, Kosygin Street 2, 119334 Moscow. Local atom-number fluctuations in quantum gases at finite temperature. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.84.033612.
Klawunn, M., Recati, A., Stringari, S., Pitaevskii, L. P., & Kapitza Institute for Physical Problems, Russian Academy of Science, Kosygin Street 2, 119334 Moscow. Local atom-number fluctuations in quantum gases at finite temperature. United States. doi:10.1103/PHYSREVA.84.033612.
Klawunn, M., Recati, A., Stringari, S., Pitaevskii, L. P., and Kapitza Institute for Physical Problems, Russian Academy of Science, Kosygin Street 2, 119334 Moscow. Thu . "Local atom-number fluctuations in quantum gases at finite temperature". United States. doi:10.1103/PHYSREVA.84.033612.
@article{osti_22068757,
title = {Local atom-number fluctuations in quantum gases at finite temperature},
author = {Klawunn, M. and Recati, A. and Stringari, S. and Pitaevskii, L. P. and Kapitza Institute for Physical Problems, Russian Academy of Science, Kosygin Street 2, 119334 Moscow},
abstractNote = {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.},
doi = {10.1103/PHYSREVA.84.033612},
journal = {Physical Review. A},
issn = {1050-2947},
number = 3,
volume = 84,
place = {United States},
year = {2011},
month = {9}
}