标题： 激光稳定化的电离跃迁 显示英文标题

标题： Laser Stabilised Ionising Transitions

摘要： 我们研究了在共振泵浦下的电离电子跃迁。 我们证明，在泵浦强度超过某一临界值时，会形成一种新的亚稳态电子束缚态，该状态可以通过双光子电离衰变到自由电子连续态。 我们计算了系统的共振荧光光谱，发现结果与束缚-束缚跃迁中预期的Mollow三重峰在定性上不同。 荧光发射可用于测量这种新型亚稳态的时间分辨的占据数。 与由非微扰、非共振激光脉冲稳定化的Kramers-Hennenberger原子相反，我们观察到的物理现象本质上是共振的，并依赖于微扰导致的能级排斥。 类似于交流Stark位移是单光子Rabi劈裂的半经典版本，我们描述的现象更适合作为最近观测到的由单个腔内光子束缚的激子的半经典版本来理解。 我们的结果展示了一种利用强激光场稳定电子态的新方法，增强了我们设计和工程化非经典物质状态的能力。 显示英文摘要

摘要： We investigate a ionising electronic transition under resonant pumping. We demonstrate that, above a critical value of the pump intensity, a novel metastable electronic bound state is created, which can decay into the free electron continuum by two-photon ionization. We calculate the system's resonant fluorescence spectrum, finding results qualitatively different from the Mollow triplet expected in a bound-to-bound transition. The fluorescent emission can be used to measure the time-resolved population of the novel metastable state. Contrary to Kramers-Hennenberger atoms, stabilised by non-perturbative, non-resonant laser pulses, the physics we observe is inherently resonant and relies on perturbative level repulsion. In analogy to how the AC-Stark shift is a semiclassical version of the single-photon Rabi splitting observed in photonic cavity, the phenomenon we describe is better understood as a semiclassical version of recently observed excitons bound by a single cavity photon. Our results demonstrate a novel way to stabilise electronic states with intense laser fields, increasing our capability to design and engineer non-classical states of matter.