论文标题
费米液体理论阐明了1L-MOS中的“热” EHL $ _2 $
Fermi Liquid Theory Sheds Light on "Hot" EHL in 1L-MoS$_2$
论文作者
论文摘要
2D过渡金属二分法（TMDC）在异常高的温度下表现出电子孔液相过渡。因为这些材料在原子上很薄，所以光激发会导致材料膨胀。结果，在EHL相跃迁期间，由于材料的热膨胀和在高激发密度下的材料热膨胀和重新归一化而导致电子带结构的发展。具体而言，这些效果导致间接间隙电子带结构，最大值位于$γ$山谷。在这项工作中，我们开发了一种方法，用于分析通过使用费米液体理论在EHL相变期间悬浮1L-MOS $ _2 $的光致发光的光谱演化。最终的分析揭示了山谷特异性的载体密度，辐射重组效率和1L-MOS $ _2 $中的内标载体放松动力学。更广泛地，结果概述了预测关键EHL参数的方法，将光散发到2D TDMC中的EHL相变。
2D transition metal dichalcogenides (TMDCs) exhibit an electron-hole liquid phase transition at unusually high temperatures. Because these materials are atomically thin, optical excitation leads to material expansion. As a result, during the EHL phase transition the electronic band structure evolves due to both material thermal expansion and renormalization of the bands under high excitation densities. Specifically, these effects lead to indirect gap electronic band structure with a valence band maximum located at the $Γ$ valley. In this work we developed a methodology for analyzing the spectral evolution of the photoluminescence of suspended 1L-MoS$_2$ during the EHL phase transition by using Fermi liquid theory. The resulting analysis reveals valley-specific carrier densities, radiative recombination efficiencies, and intraband carrier relaxation kinetics in 1L-MoS$_2$. More broadly, the results outline a methodology for predicting critical EHL parameters, shedding light onto the EHL phase transition in 2D TDMCs.
