论文标题
Mose2-WE2异质结构中层间激子的温度依赖性莫伊尔捕获
Temperature dependent moiré trapping of interlayer excitons in MoSe2-WSe2 heterostructures
论文作者
论文摘要
Mose2-WE2异质结构具有强烈结合的层间激子（IX），当扭曲角接近0°或60°时，它们表现出明亮的光致发光（PL）。在过去的几年中，关于这些异质结构的光学响应的许多报告，但没有统一模型来了解IXS的动力及其温度依赖性。在这里，我们对IXS的温度，激发能力和时间依赖性PL进行了全面研究。我们观察到高于过渡温度的PL强度的显着降低，我们将其归因于从本地化到DELEACALIGATIE IXS的过渡。令人惊讶的是，我们发现IX PL能量与过渡温度之间的简单逆关系，该温度表现出相反的功率依赖性行为，以接近0°和60°样品。我们得出的结论是，该温度依赖性是IX-IX交换相互作用的结果，其效果被低温下的Moiré电位诱捕IX抑制。
MoSe2-WSe2 heterostructures host strongly bound interlayer excitons (IXs) which exhibit bright photoluminescence (PL) when the twist-angle is near 0° or 60°. Over the past several years, there have been numerous reports on the optical response of these heterostructures but no unifying model to understand the dynamics of IXs and their temperature dependence. Here, we perform a comprehensive study of the temperature, excitation power, and time-dependent PL of IXs. We observe a significant decrease in PL intensity above a transition temperature that we attribute to a transition from localized to delocalized IXs. Astoundingly, we find a simple inverse relationship between the IX PL energy and the transition temperature, which exhibits opposite power dependent behaviors for near 0° and 60° samples. We conclude that this temperature dependence is a result of IX-IX exchange interactions, whose effect is suppressed by the moiré potential trapping IXs at low temperature.
