Nanoinfrared Characterization of Bilayer Graphene Conductivity under Dual-Gate Tuning

Luo, Weiwei; Kuzmenko, Alexey; Qi, Jialin; Zhang, Ni; Wu, Wei; Ren, Mengxin; Zhang, Xinzheng; Cai, Wei; Xu, Jingjun

doi:10.1021/acs.nanolett.1c01167

Scientific article

English

Nanoinfrared Characterization of Bilayer Graphene Conductivity under Dual-Gate Tuning

Contributors

Luo, Weiwei

; Kuzmenko, Alexey

; Qi, Jialin; Zhang, Ni; Wu, Wei; Ren, Mengxin; Zhang, Xinzheng; Cai, Wei; Xu, Jingjun

Published in

Nano letters, vol. 21, no. 12, p. 5151-5157

Publication date

2021-06-01

First online date

2021-06-01

Abstract

Dual-gate tuning on two-dimensional (2D) heterostructures can provide independent control of the carrier concentration and interlayer electrostatic potential, yielding novel electronic and optical properties. In this paper, by utilizing monolayer graphene as both the top gate and a plasmon wavelength magnifier, the optical properties of bilayer graphene (BLG) under dual-gate are quantitatively investigated by nanoinfrared imaging. The hybrid optical modes in the vertically coupled two-layer system are imaged from scattering-type scanning near-field microscopy (s-SNOM). Moreover, plasmon dispersion behaviors under varied dual-gate tuning are explored and explained well with theoretical ones employing tight binding approximation, which reveals the flexibility in individually manipulating the Fermi energy and bandgap. Especially, electron–hole asymmetry in BLG is verified from experiments. Our studies pave route for quantitative near-field investigation of superlattice, topological boundaries, and other emergent phenomena in graphene-based 2D heterostructures.

Keywords

Bilayer graphene
Dual-gate
Near-field infrared microscopy
Surface plasmons
Two-dimensional heterostructures

UNIGE affiliation entities

Faculté des sciences / Section de physique / Département de physique de la matière quantique

UNIGE research groups

Groupe Kuzmenko

Citation (ISO format)

LUO, Weiwei et al. Nanoinfrared Characterization of Bilayer Graphene Conductivity under Dual-Gate Tuning. In: Nano letters, 2021, vol. 21, n° 12, p. 5151–5157. doi: 10.1021/acs.nanolett.1c01167

Article (Published version)

Identifiers

PID : unige:157705
DOI : 10.1021/acs.nanolett.1c01167
PMID : 34060844

Additional URL for this publication

https://pubs.acs.org/doi/10.1021/acs.nanolett.1c01167

Journal ISSN

1530-6984

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04/01/2022 15:41:00

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01/11/2024 00:22:37

Nanoinfrared Characterization of Bilayer Graphene Conductivity under Dual-Gate Tuning

Contributors

Published in

Publication date

First online date

Abstract

Keywords

UNIGE affiliation entities

UNIGE research groups

Citation (ISO format)

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Identifiers

Additional URL for this publication

Journal ISSN

Technical informations

Creation

First validation

Update

Status update

Last indexation