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arXiv 2203.16299cond-mat.quant-gascond-mat.mes-hallcond-mat.stat-mechcond-mat.supr-conphysics.app-ph
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薄膜中增强的玻色-爱因斯坦凝聚的解析理论

Analytical theory of enhanced Bose-Einstein condensation in thin films

Riccardo Travaglino, Alessio Zaccone

摘要:

本文提出了一个解析可解的薄膜几何中的玻色-爱因斯坦凝聚理论。解析的封闭形式的临界温度的表达式中得到的低到中等的限制制度(其中的膜厚度$L$是在微米的顺序),以及在强限制制度的厚度是在几个纳米或更低的顺序。在强约束极限下,预测了高温BEC的可能性,临界温度$T_{c} \sim L^{-1/2}$的平方根发散。对于冷玻色气体,这意味着增强高达两个数量级的$T_{c}$的纳米尺度上的薄膜。分析预测的热容和冷凝分数也得到。一个新的法律的冷凝物,即$C \sim T^{2}$的热容量,预测纳米级的薄膜,这意味着不同的$λ$点行为相对于散装系统,而冷凝物馏分预测遵循$[1- (T/T_{c})^{2}]$法律。

英文摘要:

We present an analytically solvable theory of Bose-Einstein condensation in thin film geometries. Analytical closed-form expressions for the critical temperature are obtained in both the low-to-moderate confinement regime (where the film thickness $L$ is in the order of microns) as well as in the strong confinement regime where the thickness is in the order of few nanometers or lower. The possibility of high-temperature BEC is predicted in the strong confinement limit, with a square-root divergence of the critical temperature $T_{c} \sim L^{-1/2}$. For cold Bose gases, this implies an enhancement up to two orders of magnitude in $T_{c}$ for films on the nanometer scale. Analytical predictions are also obtained for the heat capacity and the condensate fraction. A new law for the heat capacity of the condensate, i.e. $C \sim T^{2}$, is predicted for nano-scale films, which implies a different $λ$ point behaviour with respect to bulk systems, while the condensate fraction is predicted to follow a $[1- (T/T_{c})^{2}]$ law.

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