Unconventional satellite resistance peaks in moiré superlattice of h-BN/ AB-stacked tetralayer-graphene heterostructures
| Autor: | Kota Horii, Fumiya Mukai, Takashi Taniguchi, Kenji Watanabe, Ryuta Yagi, Ryoya Ebisuoka |
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| Rok vydání: | 2021 |
| Předmět: |
Condensed Matter::Quantum Gases
Materials science Condensed matter physics Graphene Band gap Physics QC1-999 Superlattice Physics::Optics General Physics and Astronomy Fermi surface Heterojunction Astrophysics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect law.invention QB460-466 Brillouin zone Condensed Matter::Materials Science Electrical resistivity and conductivity law Anisotropy |
| Zdroj: | Communications Physics, Vol 4, Iss 1, Pp 1-7 (2021) |
| ISSN: | 2399-3650 |
| Popis: | Most studies on moire superlattices formed from a stack of h-BN (two-dimensional hexagonal boron nitride) and graphene have focused on single layer graphene; graphene with multiple layers is less understood. Here, we show that a moire superlattice of multilayer graphene shows features arising from the anisotropic Fermi surface affected by the superlattice structure. The moire superlattice of a h-BN/AB-stacked tetralayer graphene heterostructures exhibited resistivity peaks showing a complicated dependence on the perpendicular electric field. The peaks were not due to secondary Dirac cones forming, but rather opening of the energy gap due to folding of the anisotropic Fermi surface. In addition, superlattice peaks resulted from mixing of light- and heavy-mass bilayer-like bands via the superlattice potential. The gaps did not open on the boundary of the superlattice Brillouin zone, but rather opened inside it, which reflected the anisotropy of the Fermi surface of multilayer graphene. The superposition of two layers of graphene or hBN at an angle gives rise to interesting geometrical structures, named Moire superlattice, that has been intensively studied recently. The authors report on experimental data and simulations for twisted h-BN/AB-stacked tetralayer graphene heterostructures, finding that band gaps appear because of Fermi surface nesting due to the specific angle used. |
| Databáze: | OpenAIRE |
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