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  Band gap formation in commensurate twisted bilayer graphene/hBN moiré lattices

Rothstein, A., Schattauer, C., Dolleman, R. J., Trellenkamp, S., Lentz, F., Watanabe, K., et al. (2024). Band gap formation in commensurate twisted bilayer graphene/hBN moiré lattices. Physical Review B, 109(15): 155139. doi:10.1103/PhysRevB.109.155139.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000F-1372-B Version Permalink: https://hdl.handle.net/21.11116/0000-000F-313B-8
Genre: Journal Article

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PhysRevB.109.155139.pdf (Publisher version), 7MB
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https://arxiv.org/abs/2403.14393 (Preprint)
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https://doi.org/10.1103/PhysRevB.109.155139 (Publisher version)
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https://doi.org/10.5281/zenodo.10847164 (Research data)
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 Creators:
Rothstein, A.1, 2, Author
Schattauer, C.3, Author
Dolleman, R. J.1, Author
Trellenkamp, S.4, Author
Lentz, F.4, Author
Watanabe, K.5, Author
Taniguchi, T.6, Author
Kennes, D. M.7, 8, 9, Author           
Beschoten, B.1, Author
Stampfer, C.1, 2, Author
Libisch, F.3, Author
Affiliations:
1JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, ou_persistent22              
2Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich GmbH, ou_persistent22              
3Institute for Theoretical Physics, TU Wien, ou_persistent22              
4Helmholtz Nano Facility, Forschungszentrum Jülich GmbH, ou_persistent22              
5Research Center for Electronic and Optical Materials, National Institute for Materials Science, ou_persistent22              
6Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, ou_persistent22              
7Institute for Theory of Statistical Physics, RWTH Aachen University, and JARA Fundamentals of Future Information Technology, ou_persistent22              
8Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
9Center for Free-Electron Laser Science, ou_persistent22              

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 Abstract: We report on the investigation of periodic superstructures in twisted bilayer graphene (tBLG) van der Waals heterostructures, where one of the graphene layers is aligned to hexagonal boron nitride (hBN). Our theoretical simulations reveal that if the ratio of the resulting two moiré unit-cell areas is a simple fraction, the graphene/hBN moiré lattice acts as a staggered potential, breaking the degeneracy between tBLG AA sites. This leads to additional band gaps at energies where a subset of tBLG AA sites is fully occupied. These gaps manifest as Landau fans in magnetotransport, which we experimentally observe in an aligned tBLG/hBN heterostructure. Our study demonstrates the identification of commensurate tBLG/hBN van der Waals heterostructures by magnetotransport, highlights the persistence of moiré effects on length scales of tens of nanometers, and represents an interesting step forward in the ongoing effort to realize designed quantum materials with tailored properties.

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Language(s): eng - English
 Dates: 2024-02-062023-09-182024-03-202024-04-122024-04-15
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 2403.14393
DOI: 10.1103/PhysRevB.109.155139
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Project name : This work was supported by the FLAG-ERA grants TATTOOS (Grant No. 437214324), PhotoTBG (Grant No. 471733165) and 2D-NEMS (Grant No. 436607160) by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy Cluster of Excellence Matter and Light for Quantum Computing (ML4Q) EXC 2004/1–390534769, within the Priority Program SPP 2244 “2DMP”-443273985, the Helmholtz Nano Facility [55] and by the FWF doctoral school TU-DX, Grant https://doi.org/10.55776/DOC142. K.W. and T.T. acknowledge support from the JSPS KAKENHI (Grants No. 20H00354, No. 21H05233, and No. 23H02052) and World Premier International Research Center Initiative (WPI), MEXT, Japan. C.Sc. acknowledges support as a recipient of a DOC fellowship of the Austrian Academy of Sciences. Numerical calculations were in part performed on the Vienna Scientific Cluster VSC4 and VSC5.
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Source 1

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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 109 (15) Sequence Number: 155139 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008