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arXiv 2104.11259cond-mat.quant-gas
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细长玻色子约瑟夫森结中的耗散和涨落

Dissipation and fluctuations in elongated bosonic Josephson junctions

F. Binanti, K. Furutani, L. Salasnich

摘要:

研究了细长约瑟夫森结中玻色原子的动力学行为。我们发现,这些系统的特点是由约瑟夫森模式的宏观量子隧穿和声音模式之间的内在耦合。这种耦合的约瑟夫森和声模式产生了阻尼和随机朗之万动力学的约瑟夫森自由度。从微观拉氏量出发,我们推导并研究了阻尼系数和随机噪声,其中包括热涨落和量子涨落。最后,我们研究了约瑟夫森模的相对相位和布居数不平衡涨落的时间演化以及它们的振荡热化到平衡态。

英文摘要:

We investigate the dynamics of bosonic atoms in elongated Josephson junctions. We find that these systems are characterized by an intrinsic coupling between the Josephson mode of macroscopic quantum tunneling and the sound modes. This coupling of Josephson and sound modes gives rise to a damped and stochastic Langevin dynamics for the Josephson degree of freedom. From a microscopic Lagrangian, we deduce and investigate the damping coefficient and the stochastic noise, which includes thermal and quantum fluctuations. Finally, we study the time evolution of relative-phase and population-imbalance fluctuations of the Josephson mode and their oscillating thermalization to equilibrium.

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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