论文标题
超快声子驱动的电荷转移在范德华异质结构中
Ultrafast phonon-driven charge transfer in van der Waals heterostructures
论文作者
论文摘要
van der waals异质结构由垂直堆叠的过渡金属二分法（TMDS）构建，展现出丰富的能量景观，包括层间和Intervelley激子。最近的实验表明，TMD异质结构的超快电荷转移。但是，电荷转移过程的性质仍然难以捉摸。基于微观和材料现实主义的激子理论，我们揭示了通过强杂交间隔激子通过强杂交Intervalley激子介导的散射，控制了在低100FS时间尺度上发生的电荷传输过程。我们跟踪光学激发激动激素的时间，动量和能量分辨的弛豫动力学，并确定不同TMD双层的温度和堆叠依赖性电荷传递时间。所提供的见解介绍了对范德华异质结构中技术重要的电荷转移过程的微观理解的重要一步。
Van der Waals heterostructures built by vertically stacked transition metal dichalcogenides (TMDs) exhibit a rich energy landscape including interlayer and intervalley excitons. Recent experiments demonstrated an ultrafast charge transfer in TMD heterostructures. However, the nature of the charge transfer process has remained elusive. Based on a microscopic and material-realistic exciton theory, we reveal that phonon-mediated scattering via strongly hybridized intervalley excitons governs the charge transfer process that occurs on a sub-100fs timescale. We track the time-, momentum-, and energy-resolved relaxation dynamics of optically excited excitons and determine the temperature- and stacking-dependent charge transfer time for different TMD bilayers. The provided insights present a major step in microscopic understanding of the technologically important charge transfer process in van der Waals heterostructures.
