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Sunku, Sai S; Halbertal, Dorri; Engelke, Rebecca; Yoo, Hyobin; Finney, Nathan R; Curreli, Nicola; Ni, Guangxin; Tan, Cheng; McLeod, Alexander S; Lo, Chiu Fan Bowen; Dean, Cory R; Hone, James C; Kim, Philip; Basov, D. N
Nano letters, 02/2021, Volume: 21, Issue: 4Journal Article
Graphene-based heterostructures display a variety of phenomena that are strongly tunable by electrostatic local gates. Monolayer graphene (MLG) exhibits tunable surface plasmon polaritons, as revealed by scanning nano-infrared experiments. In bilayer graphene (BLG), an electronic gap is induced by a perpendicular displacement field. Gapped BLG is predicted to display unusual effects such as plasmon amplification and domain wall plasmons with significantly larger lifetime than MLG. Furthermore, a variety of correlated electronic phases highly sensitive to displacement fields have been observed in twisted graphene structures. However, applying perpendicular displacement fields in nano-infrared experiments has only recently become possible Li, H. ; Nano Lett. 2020, 20, 3106−3112 . In this work, we fully characterize two approaches to realizing nano-optics compatible top gates: bilayer MoS2 and MLG. We perform nano-infrared imaging on both types of structures and evaluate their strengths and weaknesses. Our work paves the way for comprehensive near-field experiments of correlated phenomena and plasmonic effects in graphene-based heterostructures.
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