Electronic structure of <math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mn>3</mn><mo>∘</mo></msup></math>-twisted bilayer graphene on 4H-SiC(0001)

Takushi Iimori; Anton Visikovskiy; Hitoshi Imamura; Toshio Miyamachi; Miho Kitamura; Koji Horiba; Hiroshi Kumigashira; Kazuhiko Mase; Kan Nakatsuji; Satoru Tanaka; Fumio Komori

doi:10.1103/PhysRevMaterials.5.L051001

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Electronic structure of $3^{\circ}$ -twisted bilayer graphene on 4H-SiC(0001)

Takushi Iimori ¹, Anton Visikovskiy², Hitoshi Imamura ², Toshio Miyamachi¹, Miho Kitamura^3,4, Koji Horiba^3,4, Hiroshi Kumigashira^3,5, Kazuhiko Mase^3,4, Kan Nakatsuji⁶ et al.

Satoru Tanaka² and Fumio Komori ^1,*

¹Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
²Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Fukuoka 819-0395, Japan
³Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
⁴Department of Materials Structure Science, SOKENDAI (The Graduate University for Advanced Studies), Tsukuba 305-0801, Japan
⁵Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai 980-8577, Japan
⁶Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama 226-8502, Japan

^*komori@issp.u-tokyo.ac.jp

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Phys. Rev. Materials 5, L051001 – Published 13 May, 2021

DOI: https://doi.org/10.1103/PhysRevMaterials.5.L051001

Abstract

The electronic structure of $3^{\circ}$ -twisted bilayer graphene (TBG) is studied by angle-resolved photoelectron spectroscopy (ARPES). Sub-mm-sized TBG prepared by direct bonding in a high vacuum enabled us to use conventional ARPES band mapping with synchrotron light. The results indicate that strong interlayer coupling makes a moiré potential for the Dirac electrons and significantly modifies the graphene bands around the $\bar{K}$ points such as the band splitting and electron velocity reduction. The observed electronic structure is consistently reproduced by tight-binding calculations combined with a band unfolding method.

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Electronic structure of $3^{\circ}$ -twisted bilayer graphene on 4H-SiC(0001)

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Electronic structure of 3∘-twisted bilayer graphene on 4H-SiC(0001)

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Electronic structure of $3^{\circ}$ -twisted bilayer graphene on 4H-SiC(0001)