论文标题
通过超快核心观察激发莫特的过渡 - $ \ textit {cum} $ - 传导光发射光谱
Observation of an excitonic Mott transition through ultrafast core-$\textit{cum}$-conduction photoemission spectroscopy
论文作者
论文摘要
时间分辨的软X射线光发射光谱用于同时测量核心级光谱函数的超快动力学和激发态在WSE $ _2 $中激发的激发态。我们为绿色功能提供了多体近似，它很好地描述了瞬态核心孔谱函数。激发态信号和核心水平的相对动力学揭示了由于激发准载体筛选而导致的核心孔重新归一化延迟，从而揭示了激发型Mott Mott Transition。这些发现建立了时间分辨的核心光电光谱，作为微妙的电子多体相互作用和超快电子相变的灵敏探针。
Time-resolved soft-X-ray photoemission spectroscopy is used to simultaneously measure the ultrafast dynamics of core-level spectral functions and excited states upon excitation of excitons in WSe$_2$. We present a many-body approximation for the Green's function, which excellently describes the transient core-hole spectral function. The relative dynamics of excited-state signal and core levels reveals a delayed core-hole renormalization due to screening by excited quasi-free carriers, revealing an excitonic Mott transition. These findings establish time-resolved core-level photoelectron spectroscopy as a sensitive probe of subtle electronic many-body interactions and an ultrafast electronic phase transition.
