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  Tunable multi-bands in twisted double bilayer graphene

Zhu, Y., Chen, Y., Li, Q., Chen, Y., Huang, Y., Zhu, W., et al. (2022). Tunable multi-bands in twisted double bilayer graphene. 2D Materials, 9(3): 034001. doi:10.1088/2053-1583/ac69bb.

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https://doi.org/10.1088/2053-1583/ac69bb (Publisher version)
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 Creators:
Zhu, Y.1, Author
Chen, Y.1, Author
Li, Q.1, Author
Chen, Y.2, Author
Huang, Y.1, Author
Zhu, W.1, Author
An, D.1, Author
Song, J.1, Author
Gan, Q.1, Author
Wang, K.1, Author
Wei, L.1, Author
Zong, Q.1, Author
Watanabe, K.3, Author
Taniguchi, T.3, Author
Wang, H.4, Author
Huang, L.2, Author
Xian, L. D.5, 6, 7, Author              
Sun, L.1, Author
Yu, G.1, Author
Wang, L.1, Author
Affiliations:
1National Laboratory of Solid-State Microstructures, School of Physics, Nanjing University, ou_persistent22              
2Department of Physics, Southern University of Science and Technology, ou_persistent22              
3National Institute for Materials Science, Namiki 1-1, Tsukuba, ou_persistent22              
4School of Advanced Materials and Nanotechnology, Xidian University, ou_persistent22              
5Songshan Lake Materials Laboratory, Dongguan, ou_persistent22              
6Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
7Center for Free-Electron Laser Science, ou_persistent22              

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 Abstract: The bandstructure of a material, playing an important role in its electron transport property, is usually governed by the lattice configuration. Materials with a field-effect tunable band, such as bilayer [1] and rhombohedral trilayer graphene [2, 3], are more flexible for electronic applications. Here, on dual-gated twisted double bilayer graphene (TDBG) samples with small twist angle around 1∘, we observe vertical electric-field-tunable bandstructures at multiple moiré fillings with bandgap values continuously varying from zero to tens of mili-electron volts. Moreover, within the first moiré filling on both electron and hole sides, the carrier transport deviates from Fermi liquid behavior, with measured resistivity exhibiting linear temperature dependence between 1.5 K and 50 K. Furthermore, under a vertical magnetic field, the coupling between the two bilayer graphene layers can also be turned on and off by a displacement field. Our results suggest TDBG with small twist angle is a platform for studying the evolution of multiple electric field tunable moiré bands and the resulting emergent correlated electronic phases.

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Language(s): eng - English
 Dates: 2022-03-032022-04-232022-05-11
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1088/2053-1583/ac69bb
 Degree: -

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Title: 2D Materials
  Abbreviation : 2D Mater.
Source Genre: Journal
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Publ. Info: Bristol : IOP Publ.
Pages: - Volume / Issue: 9 (3) Sequence Number: 034001 Start / End Page: - Identifier: ISSN: 2053-1583
CoNE: https://pure.mpg.de/cone/journals/resource/2053-1583