Atomically thin layered van der Waals (vdW) heterostructures feature exotic and emergent optoelectronic properties.[1] With growing interest in these novel quantum materials, the microscopic understanding of the fundamental interlayer coupling is of capital importance.[2] Here, using four-dimensional photoemission spectroscopy, we provide a layer- and momentum-resolved view on ultrafast interlayer electron and energy transfer across a monolayer (ML)-WSe
2/graphene heterostructure.
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