论文标题
在超短时间尺度上控制浮动状态
Controlling Floquet states on ultrashort time scales
论文作者
论文摘要
Ultrafast激光科学的出现为将Floquet Engineering与极端时间分辨率相结合的独特机会提供了独特的机会，进一步将物质的光学控制推向了Petahertz域。但是，可以实现浮子状态的最短驱动脉冲是什么是未解决的问题，因此限制了浮雕理论在许多光周期组成的脉冲中的应用。在这里，我们将NE原子电离为几秒脉冲的选定时间持续时间，并表明可以在驾驶场的10个周期内建立浮雕状态。对于较短的脉冲，低至2个周期，仍可以使用基于浮标理论的分析模型来解释驱动状态的有限寿命。通过证明Floquet边带的种群不仅可以通过驱动激光脉冲强度和频率来控制，而且还可以通过其持续时间来控制，我们的结果为Floquet Engineering的工具箱增加了一个新的杠杆。
The advent of ultrafast laser science offers the unique opportunity to combine Floquet engineering with extreme time resolution, further pushing the optical control of matter into the petahertz domain. However, what is the shortest driving pulse for which Floquet states can be realised remains an unsolved matter, thus limiting the application of Floquet theory to pulses composed by many optical cycles. Here we ionized Ne atoms with few-femtosecond pulses of selected time duration and show that a Floquet state can be established already within 10 cycles of the driving field. For shorter pulses, down to 2 cycles, the finite lifetime of the driven state can still be explained using an analytical model based on Floquet theory. By demonstrating that the population of the Floquet sidebands can be controlled not only with the driving laser pulse intensity and frequency, but also by its duration, our results add a new lever to the toolbox of Floquet engineering.
