论文标题
超级产生和融化的非平衡激素冷凝水在散装中$ _ {2} $
Ultrafast creation and melting of nonequilibrium excitonic condensates in bulk WSe$_{2}$
论文作者
论文摘要
我们研究了与最低能源激子相干谐振剂照亮时，以散装的WSE $ _ {2} $形成的非平衡激素共识的筛选动力学。 Intervalley散射导致电子从光学填充的K谷迁移到最低$σ$的传导带。由于电子孔的不平衡在K点A a的血浆中，不含准孔的血浆会产生，从而有效地筛选了其余激子的相互作用。我们表明，这种等离子体筛选会导致非平衡共识的超快熔化，并且在熔化相干的激子和无准电子孔对共存期间。时间分辨的光谱函数确实表现出相反的凸度和相对光谱重量的传导和激子侧带，它们的时间变化。时间依赖性传导密度对激光强度的依赖性和时间分辨光谱函数都与最近的实验一致。
We study the screened dynamics of the nonequilibrium excitonic consensate forming in a bulk WSe$_{2}$ when illuminated by coherent light resonant with the lowest-energy exciton. Intervalley scattering causes electron migration from the optically populated K valley to the conduction band minimum at $Σ$. Due to the electron-hole unbalance at the K point a plasma of quasi-free holes develops, which efficiently screens the interaction of the remaining excitons. We show that this plasma screening causes an ultrafast melting of the nonequilibrium consensate and that during melting coherent excitons and quasi-free electron-hole pairs coexist. The time-resolved spectral function does exhibit a conduction and excitonic sidebands of opposite convexity and relative spectral weight that changes in time. Both the dependence of the time-dependent conduction density on the laser intensity and the time-resolved spectral function agree with recent experiments.
