Abstract
Twisted bilayer graphene (tBLG) is two stacked single graphene sheets rotated at a specific angle. The twist angle plays an important role in the physical properties of the tBLG. In this study, we analyzed the interaction distance between two graphene layers in tBLG using Raman spectroscopy and atomic force microscopy. To confirm the interaction of the upper and bottom graphenes in the tBLG, we prepared two tBLGs with twist angles of 5° and 24°. The interlayer distance was controlled by depositing a gold bar between the two graphene layers. We found that the decoupling interlayer distance of the tBLG was different depending on the twist angle (0.74 nm for 5° and 1.66 nm for 24°). This indicates that the interaction between two graphene layers is strongly coupled with small twist angle, as expected.
Highlights
Graphene, a two-dimensional carbon structure, is considered a highly promising material because of its unique properties, including high electron mobility, good mechanical properties, and quantum Hall effect.[1,2,3,4,5,6] graphene is unsuitable for many applications because it has no band gap
The linear dispersion relation which exists in single layer graphene (SLG) is retained in the tBLG at a certain twist angle,[13] and physical properties such as optical and electrical characteristics can be changed depending on the angle.[14,15,16]
The van Hove singularity has been observed in tBLG with strong interactions between two layers, due to the small twist angle, which is not observed in SLG.[17,18,19]
Summary
A two-dimensional carbon structure, is considered a highly promising material because of its unique properties, including high electron mobility, good mechanical properties, and quantum Hall effect.[1,2,3,4,5,6] graphene is unsuitable for many applications because it has no band gap. Experimental evidence for interlayer decoupling distance of twisted bilayer graphene Experimental evidence for interlayer decoupling distance of twisted bilayer graphene Jun Woo Jeon,1,a Hyeonbeom Kim,1,a,b Hyuntae Kim,[1] Soobong Choi,[1,2] and Byung Hoon Kim1,2,c 1Department of Physics, Incheon National University, Incheon 22012, Republic of Korea 2Intelligent Sensor Convergence Research Center, Incheon National University, Incheon 22012, Republic of Korea (Received 4 June 2018; accepted 20 July 2018; published online 30 July 2018)
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