莫特绝缘体的相干泵浦：费米黄金法则与拉比振荡
Coherent pumping of a Mott insulator: Fermi golden rule versus Rabi oscillations
摘要：
冷原子为研究远离平衡态的多体系统提供了一个独特的舞台。此外，冷原子系统中的新相位的动力学探针推动系统的平衡方便地调查。本文讨论了通过周期性调制跳频振幅对费米子莫特绝缘体中双占据位的抽运。我们发现，在绝缘相的多体系统可以映射到一个有效的两能级系统，由于驱动执行相干拉比振荡。将两能级系统耦合到剩余的自由度会使拉比振荡得到衰减。我们比较这个方案的另一种描述，其中的粒子被非相干泵入一个广泛的连续。
英文摘要：
Cold atoms provide a unique arena to study many-body systems far from equilibrium. Furthermore, novel phases in cold atom systems are conveniently investigated by dynamical probes pushing the system out of equilibrium. Here, we discuss the pumping of doubly-occupied sites in a fermionic Mott insulator by a periodic modulation of the hopping amplitude. We show that deep in the insulating phase the many-body system can be mapped onto an effective two-level system which performs coherent Rabi oscillations due to the driving. Coupling the two-level system to the remaining degrees of freedom renders the Rabi oscillations damped. We compare this scheme to an alternative description where the particles are incoherently pumped into a broad continuum.
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