3 years ago

Coulomb drag transistor via graphene/MoS2 heterostructures.

Sanghyup Lee, Young Hee Lee, Hye Yun Jeong, Hyun Kim, Hyo Yeol Kwak, Youngjo Jin, Min-Kyu Joo, Byoung Hee Moon

Two-dimensional (2D) heterointerfaces often provide extraordinary carrier transport as exemplified by superconductivity or excitonic superfluidity. Recently, double-layer graphene separated by few-layered boron nitride demonstrated the Coulomb drag phenomenon: carriers in the active layer drag the carriers in the passive layer. Here, we propose a new switching device operating via Coulomb drag interaction at a graphene/MoS2 (GM) heterointerface. The ideal van der Waals distance allows strong coupling of the interlayer electron-hole pairs, whose recombination is prevented by the Schottky barrier formed due to charge transfer at the heterointerface. This device exhibits a high carrier mobility (up to ~3,700 cm^2V^-1s^-1) even at room temperature, while maintaining a high on/off current ratio (~10^8), outperforming those of individual layers. In the electron-electron drag regime, graphene-like Shubnikov-de Haas oscillations are observed at low temperatures. Our Coulomb drag transistor could provide a shortcut for the practical application of quantum-mechanical 2D heterostructures at room temperature.

Publisher URL: http://arxiv.org/abs/1710.11365

DOI: arXiv:1710.11365v1

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