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arXiv 1609.01751cond-mat.quant-gas
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量子涨落诱导的相互作用囚禁玻色气体的飞行时间关联

Quantum fluctuation induced time of flight correlations of an interacting trapped Bose gas

Izabella Lovas, Balázs Dóra, Eugene Demler, Gergely Zaránd

摘要:

利用保粒子数Bogoliubov近似,数值研究了$T=0$温度下二维简谐囚禁相互作用玻色系统的动量关联.准凝聚体的相互作用引起的量子涨落导致波数为$\mathbf{k}$和$-\mathbf{k}$的粒子之间的大的反关联倾角为$|\mathbf{k}|\sim 1/R_c$,与$R_c$的凝聚体的典型尺寸。发现的反相关下降是凝聚体的相干量子涨落的清晰指纹。与此相反,对于较大的波数,$|\mathbf{k}| >> 1/R_c$,一个弱的正相关被发现之间的粒子波数$\mathbf{k}$和$-\mathbf{k}$,根据Bogoliubov结果均匀的相互作用系统。

英文摘要:

We investigate numerically the momentum correlations in a two dimensional, harmonically trapped interacting Bose system at $T=0$ temperature, by using a particle number preserving Bogoliubov approximation. Interaction induced quantum fluctuations of the quasi-condensate lead to a large anti-correlation dip between particles of wave numbers $\mathbf{k}$ and $-\mathbf{k}$ for $|\mathbf{k}|\sim 1/R_c$, with $R_c$ typical size of the condensate. The anti-correlation dip found is a clear fingerprint of coherent quantum fluctuations of the condensate. In contrast, for larger wave numbers, $|\mathbf{k}| >> 1/R_c$, a weak positive correlation is found between particles of wave numbers $\mathbf{k}$ and $-\mathbf{k}$, in accordance with the Bogoliubov result for homogeneous interacting systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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