通过成像其电子和空穴组分捕获的莫尔局域层间激子波函数
Moiré-localized interlayer exciton wavefunctions captured by imaging its electron and hole constituents
摘要：
层间激子（ILXs）-电子-空穴对束缚在两个原子级薄的层状半导体上-已经成为研究激子凝聚，单光子发射和其他量子信息应用的有吸引力的平台。然而，尽管进行了广泛的光学光谱研究，但关于它们的大小、谷结构和莫尔电位的影响的关键信息仍然未知。在这里，我们捕捉到的时间和动量分辨分布的电子和空穴结合形成ILX在WSe 2/MoS 2异质结构的图像。因此，我们获得了直接测量的层间激子直径为~5.4 nm，相当于6.1 nm的莫尔晶胞长度。令人惊讶的是，这个大的ILX很好地定位在摩尔单元内仅1.8 nm的区域-小于激子本身的尺寸。层间激子的这种高度局部化得到Bethe-Salpeter方程计算的支持，并表明ILX可以局部化在小莫尔晶胞内。与大型莫尔细胞不同，这些在大区域上是均匀的，从而允许形成量子技术的局部激发的扩展阵列。
英文摘要：
Interlayer excitons (ILXs) - electron-hole pairs bound across two atomically thin layered semiconductors - have emerged as attractive platforms to study exciton condensation, single-photon emission and other quantum-information applications. Yet, despite extensive optical spectroscopic investigations, critical information about their size, valley configuration and the influence of the moiré potential remains unknown. Here, we captured images of the time- and momentum-resolved distribution of both the electron and the hole that bind to form the ILX in a WSe2/MoS2 heterostructure. We thereby obtain a direct measurement of the interlayer exciton diameter of ~5.4 nm, comparable to the moiré unit-cell length of 6.1 nm. Surprisingly, this large ILX is well localized within the moiré cell to a region of only 1.8 nm - smaller than the size of the exciton itself. This high degree of localization of the interlayer exciton is backed by Bethe-Salpeter equation calculations and demonstrates that the ILX can be localized within small moiré unit cells. Unlike large moiré cells, these are uniform over large regions, thus allowing the formation of extended arrays of localized excitations for quantum technology.
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