无耗散玻色-爱因斯坦凝聚体中的非平衡Josephson振荡
Nonequilibrium Josephson oscillations in Bose-Einstein condensates without dissipation
摘要：
我们对有限尺寸双阱中相互作用的玻色-爱因斯坦凝聚体之间的非平衡约瑟夫森振荡进行了详细的场论研究。我们发现，约瑟夫森结可以维持多个无阻尼约瑟夫森振荡的特征时间尺度$τ_c$没有准粒子被激发的系统。这可以解释最近的相关实验。在更大的时候，动态的交界处的离散准粒子水平之间的快速拉比振荡。我们预测，自陷BEC态将被这些拉比振荡破坏。
英文摘要：
We perform a detailed field theoretical study of nonequilibrium Josephson oscillations between interacting Bose-Einstein condensates confined in a finite-size double-well trap. We find that the Josephson junction can sustain multiple undamped Josephson oscillations up to a characteristic time scale $τ_c$ without quasipartcles being excited in the system. This may explain recent related experiments. At larger times the dynamics of the junction is governed by fast Rabi oscillations between the descrete quasiparticle levels. We predict that a selftrapped BEC state will be destroyed by these Rabi oscillations.
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