Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2004-01-08
Physical Review A 68, 065601 (2003)
Physics
Condensed Matter
Soft Condensed Matter
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.
Huang Guoxiang
Liu Shujuan
Xiong Hongwei
Xu Zhijun
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