论文标题
临界的多体热引擎
A many-body heat engine at criticality
论文作者
论文摘要
我们表明，量子循环中介质（相互作用的超速气体）在超流体和绝缘阶段之间驱动可以优于相似的单个颗粒周期。两个阶段之间的能量差距的存在可用于提高性能，而晶格力与颗粒分布之间的相互作用可以导致多体合作效应。由于该周期的有限时间驱动会产生不必要的非平衡动力学，从而大大损害发动机周期的性能，因此我们还设计了多体状态的近似快捷方式，可用于在关键点上实现有效的奥托周期。
We show that a quantum Otto cycle in which the medium, an interacting ultracold gas, is driven between a superfluid and an insulating phase can outperform similar single particle cycles. The presence of an energy gap between the two phases can be used to improve performance, while the interplay between lattice forces and the particle distribution can lead to a many-body cooperative effect. Since finite time driving of this cycle can create unwanted non-equilibrium dynamics which can significantly impair the performance of the engine cycle, we also design an approximate shortcut to adiabaticity for the many-body state that can be used to achieve an efficient Otto cycle around a critical point.
