量子搅动作为一维超流性的灵敏探针
Quantum stirring as a sensitive probe of 1D superfluidity
摘要：
我们提出用激光束的量子搅动作为强相互作用的一维玻色气体的超流行为的探针。在Luttinger液体理论框架内，我们计算了每周期搅拌粒子的分数作为搅拌速度，相互作用强度和搅拌束和玻色子之间的耦合的函数。搅拌颗粒的分数允许探测系统的超流性。我们发现，它跨越在一个临界速度，低于声音的，从一个特征的幂律在高速低速度常数。讨论了环阱凝聚体中量子搅拌的一些实验问题。
英文摘要：
We propose quantum stirring with a laser beam as a probe of superfluid behavior for a strongly interacting one-dimensional Bose gas confined to a ring. Within the Luttinger liquid theory framework, we calculate the fraction of stirred particles per period as a function of the stirring velocity, the interaction strength and the coupling between the stirring beam and the bosons. The fraction of stirred particles allows to probe superfluidity of the system. We find that it crosses over at a critical velocity, lower than the sound one, from a characteristic power law at high velocities to a constant at low velocities. Some experimental issues on quantum stirring in ring-trapped condensates are discussed.
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