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나노 구조 물리 연구단
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Gate tunable optical absorption and band structure of twisted bilayer graphene

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Title
Gate tunable optical absorption and band structure of twisted bilayer graphene
Author(s)
Kwangnam Yu; Nguyen Van Luan; Taesoo Kim; Jiwon Jeon; Jiho Kim; Pilkyung Moon; Young Hee Lee; E. J. Choi
Publication Date
2019-06
Journal
PHYSICAL REVIEW B, v.99, no.24, pp.241405(R) -
Publisher
AMER PHYSICAL SOC
Abstract
We report the infrared transmission measurement on electrically gated twisted bilayer graphene. The optical absorption spectrum clearly manifests dramatic changes such as the splitting of the interlinear-band absorption step, the shift of the inter-van Hove singularity transition peak, and the emergence of a very strong intravalence (intraconduction) band transition. These anomalous optical behaviors demonstrate consistently a nonrigid band structure modification created by ion-gel gating through layer-dependent Coulomb screening. We propose that this screening-driven band modification is a universal phenomenon that persists to other bilayer crystals in general, establishing electrical gating as a versatile technique to engineer band structures and to create different types of optical absorptions that can be exploited in electro-optical device applications. ©2019 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/6155
ISSN
2469-9950
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Center for Geometry and Physics(기하학 수리물리 연구단) > Journal Papers (저널논문)
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