SISSA, Via Bonomea 265, I-34136 Trieste, Italy.
Phys Rev Lett. 2012 Dec 21;109(25):257201. doi: 10.1103/PhysRevLett.109.257201. Epub 2012 Dec 17.
We study the coherent dynamics of a quantum many-body system subject to a time-periodic driving. We argue that in many cases, destructive interference in time makes most of the quantum averages time periodic, after an initial transient. We discuss in detail the case of a quantum Ising chain periodically driven across the critical point, finding that, as a result of quantum coherence, the system never reaches an infinite temperature state. Floquet resonance effects are moreover observed in the frequency dependence of the various observables, which display a sequence of well-defined peaks or dips. Extensions to nonintegrable systems are discussed.
我们研究了在周期性驱动下的量子多体系统的相干动力学。我们认为，在许多情况下，时间上的相消干涉使得大部分量子平均值在初始瞬态后具有时间周期性。我们详细讨论了周期性驱动穿过临界点的量子伊辛链的情况，发现由于量子相干，系统永远不会达到无限温度状态。在各种可观测量的频率依赖性中还观察到了弗洛凯共振效应，它们显示出一系列明确的峰或谷。此外，还讨论了对非可积系统的扩展。
