Journal
PHYSICAL REVIEW B
Volume 99, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.241405
Keywords
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2017R1A2B4007782]
- NYU Shanghai (Start-Up Funds)
- NYU-ECNU Institute of Physics at NYU Shanghai
- New York University Global Seed Grants for Collaborative Research
- Institute for Basic Science [IBS-R011-D1]
- National Research Foundation of Korea [2017R1A2B4007782] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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