论文标题

从隧道电子到激子的能量转移

Energy transfer from tunneling electrons to excitons

论文作者

Papadopoulos, Sotirios, Wang, Lujun, Taniguchi, Takashi, Watanabe, Kenji, Novotny, Lukas

论文摘要

光电设备中的激子是通过光激发,外部载体注入或采用预先存在的电荷生成的。在这里,我们揭示了一种在过渡金属二分法(TMD)中产生激子的新方法。 TMD放置在隧道途径外的金HBN-Graphene隧道交界处。该电动驱动的设备具有光发射光谱,在TMD的激子能量处具有独特的峰值。我们将这种观察结果解释为通过隧道电子的能量转移将这种观察结果解释为激子的产生,这是基于非弹性电子隧道的理论模型进一步支持的。我们的发现引入了一种新的范式异质结构中激子创建的范式,并为一类新的光电设备提供了灵感,其中光学活性材料与电气路径分开。

Excitons in optoelectronic devices have been generated through optical excitation, external carrier injection, or employing pre-existing charges. Here, we reveal a new way to electrically generate excitons in transition metal dichalcogenides (TMDs). The TMD is placed on top of a gold-hBN-graphene tunnel junction, outside of the tunneling pathway. This electrically driven device features a photoemission spectrum with a distinct peak at the exciton energy of the TMD. We interpret this observation as exciton generation by energy transfer from tunneling electrons, which is further supported by a theoretical model based on inelastic electron tunneling. Our findings introduce a new paradigm for exciton creation in van der Waals heterostructures and provide inspiration for a new class of optoelectronic devices in which the optically active material is separated from the electrical pathway.

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