Local atom-number fluctuations in quantum gases at finite temperature
Local atom-number fluctuations in quantum gases at finite temperature
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DOI：
10.1103/physreva.84.033612
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发表时间：
2011-09-13
影响因子：
2.9
通讯作者：
Stringari, S.
中科院分区：
文献类型：
--
作者：
Klawunn, M.;Recati, A.;Stringari, S.
我们研究了量子气体小晶胞中的数涨落，指出了与等温压缩性所确定的热力学极限的重要偏差。弱以及高度可压缩流体的量子和热涨落被认为是。对于二维（2D）超流玻色气体，我们发现一个显着淬火的波动相对于热力学极限，与最近的实验结果一致。增强的热波动，而不是预测的2D偶极超流玻色气体，这变得戏剧性时，样品池的大小是由相互作用引起的旋激的波长的顺序。
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.