TY - JOUR
T1 - Electronic structure of 3°-twisted bilayer graphene on 4H-SiC(0001)
AU - Iimori, Takushi
AU - Visikovskiy, Anton
AU - Imamura, Hitoshi
AU - Miyamachi, Toshio
AU - Kitamura, Miho
AU - Horiba, Koji
AU - Kumigashira, Hiroshi
AU - Mase, Kazuhiko
AU - Nakatsuji, Kan
AU - Tanaka, Satoru
AU - Komori, Fumio
N1 - Funding Information:
We thank Yu-ichiro Matsushita and Atsushi Oshiyama for valuable discussions on the tight-binding calculations and the experimental results. We also thank Iwao Matsuda and Suguru Ito for collaborations in the ARPES measurements, and Ryu Yukawa, Yukiaki Ishida, and Koichiro Yaji for the ARPES data analyses. This work was partly supported by JSPS Grant-in-Aid for Scientific Research (B), KAKENHI, Grants No. JP18H01146 and No. JP19H02595; for Scientific Research on Innovative Areas Grant No. 20H05179; for Challenging Research (Exploratory) Grant No. JP20K21119. The ARPES measurements were performed at BL-13B and BL-2A, Photon Factory, KEK, Japan (PF-PAC Grants No. 2017G575 and No. 2019G632).
Publisher Copyright:
© 2021 American Physical Society.
PY - 2021/5
Y1 - 2021/5
N2 - The electronic structure of 3°-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 K̄ 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.
AB - The electronic structure of 3°-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 K̄ 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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U2 - 10.1103/PhysRevMaterials.5.L051001
DO - 10.1103/PhysRevMaterials.5.L051001
M3 - Article
AN - SCOPUS:85106383522
SN - 2475-9953
VL - 5
JO - Physical Review Materials
JF - Physical Review Materials
IS - 5
M1 - L051001
ER -