Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-02-18
Phys. Rev. A 84, 033612 (2011)
Physics
Condensed Matter
Quantum Gases
6 pages, 5 figures
Scientific paper
10.1103/PhysRevA.84.033612
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.
Klawunn Michael
Pitaevskii Lev P.
Recati Alessio
Stringari Sandro
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