Dual-Gated Graphene Devices for Near-Field Nano-imaging.

Autor: Sunku SS; Department of Physics, Columbia University, New York, New York 10027, United States.; Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States., Halbertal D; Department of Physics, Columbia University, New York, New York 10027, United States., Engelke R; Department of Physics, Harvard University, Cambridge, Massachusetts 02138, United States., Yoo H; Department of Physics, Harvard University, Cambridge, Massachusetts 02138, United States., Finney NR; Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States., Curreli N; Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States., Ni G; Department of Physics, Columbia University, New York, New York 10027, United States., Tan C; Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States., McLeod AS; Department of Physics, Columbia University, New York, New York 10027, United States., Lo CFB; Department of Physics, Columbia University, New York, New York 10027, United States., Dean CR; Department of Physics, Columbia University, New York, New York 10027, United States., Hone JC; Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States., Kim P; Department of Physics, Harvard University, Cambridge, Massachusetts 02138, United States., Basov DN; Department of Physics, Columbia University, New York, New York 10027, United States.
Jazyk: angličtina
Zdroj: Nano letters [Nano Lett] 2021 Feb 24; Vol. 21 (4), pp. 1688-1693. Date of Electronic Publication: 2021 Feb 15.
DOI: 10.1021/acs.nanolett.0c04494
Abstrakt: 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 MoS 2 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.
Databáze: MEDLINE
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