石墨烯
材料科学
异质结
凝聚态物理
光致发光
半导体
放松(心理学)
纳米尺度
联轴节(管道)
电荷(物理)
化学物理
猝灭(荧光)
光电子学
纳米技术
光学
荧光
物理
量子力学
心理学
社会心理学
冶金
作者
Wenjin Luo,Renkang Song,Benjamin G. Whetten,Di Huang,Xinbin Cheng,Alexey Belyanin,Tongying Jiang,Markus B. Raschke
出处
期刊:Small
[Wiley]
日期:2024-01-26
标识
DOI:10.1002/smll.202307345
摘要
Abstract The emergent electronic, spin, and other quantum properties of 2D heterostructures of graphene and transition metal dichalcogenides are controlled by the underlying interlayer coupling and associated charge and energy transfer dynamics. However, these processes are sensitive to interlayer distance and crystallographic orientation, which are in turn affected by defects, grain boundaries, or other nanoscale heterogeneities. This obfuscates the distinction between interlayer charge and energy transfer. Here, nanoscale imaging in coherent four‐wave mixing (FWM) and incoherent two‐photon photoluminescence (2PPL) is combined with a tip distance‐dependent coupled rate equation model to resolve the underlying intra‐ and inter‐layer dynamics while avoiding the influence of structural heterogeneities in mono‐ to multi‐layer graphene/WSe 2 heterostructures. With selective insertion of hBN spacer layers, it is shown that energy, as opposed to charge transfer, dominates the interlayer‐coupled optical response. From the distinct nano‐FWM and ‐2PPL tip‐sample distance‐dependent modification of interlayer and intralayer relaxation by tip‐induced enhancement and quenching, an interlayer energy transfer time of ps consistent with recent reports is derived. As a local probe technique, this approach highlights the ability to determine intrinsic sample properties even in the presence of large sample heterogeneity.
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