Anomalous particle-number fluctuations in a three-dimensional interacting Bose-Einstein condensate

Physics – Condensed Matter – Soft Condensed Matter

Scientific paper

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RevTex, 4 pages

Scientific paper

10.1103/PhysRevA.68.065601

The particle-number fluctuations originated from collective excitations are investigated for a three-dimensional, repulsively interacting Bose-Einstein condensate (BEC) confined in a harmonic trap. The contribution due to the quantum depletion of the condensate is calculated and the explicit expression of the coefficient in the formulas denoting the particle-number fluctuations is given. The results show that the particle-number fluctuations of the condensate follow the law $<\delta N_0^2> \sim N^{22/15}$ and the fluctuations vanish when temperature approaches to the BEC critical temperature.

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