有限温度下隧道耦合一维原子准凝聚体间的相干性和约瑟夫森振荡
Coherence and Josephson oscillations between two tunnel-coupled one-dimensional atomic quasicondensates at finite temperature
摘要：
我们重新回顾了有限温度下双阱中隧道耦合原子准凝聚体的理论。用泛函积分方法计算了相对相位及其共轭相对密度变量的小涨落谐波极限以外的相对相位关联函数。我们发现，两个quascondensates之间的相对相位的热涨落降低约瑟夫森振荡的频率，甚至洗出这些振荡的隧道耦合的小值。
英文摘要：
We revisit the theory of tunnel-coupled atomic quasicondensates in double-well elongated traps at finite temperatures. Using the functional-integral approach, we calculate the relative-phase correlation function beyond the harmonic limit of small fluctuations of the relative phase and its conjugate relative-density variable. We show that the thermal fluctuations of the relative phase between the two quasicondensates decrease the frequency of Josephson oscillations and even wash out these oscillations for small values of the tunnel coupling.
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