Band gap formation in commensurate twisted bilayer graphene/hBN moiré lattices
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866914752852131840 |
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| author | Rothstein, Alexander Schattauer, Christoph Dolleman, Robin J. Trellenkamp, Stefan Lentz, Florian Watanabe, Kenji Taniguchi, Takashi Kennes, Dante M. Beschoten, Bernd Stampfer, Christoph Libisch, Florian |
| author_facet | Rothstein, Alexander Schattauer, Christoph Dolleman, Robin J. Trellenkamp, Stefan Lentz, Florian Watanabe, Kenji Taniguchi, Takashi Kennes, Dante M. Beschoten, Bernd Stampfer, Christoph Libisch, Florian |
| contents | 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 realise designed quantum materials with tailored properties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_14393 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Band gap formation in commensurate twisted bilayer graphene/hBN moiré lattices Rothstein, Alexander Schattauer, Christoph Dolleman, Robin J. Trellenkamp, Stefan Lentz, Florian Watanabe, Kenji Taniguchi, Takashi Kennes, Dante M. Beschoten, Bernd Stampfer, Christoph Libisch, Florian Mesoscale and Nanoscale Physics Materials Science 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 realise designed quantum materials with tailored properties. |
| title | Band gap formation in commensurate twisted bilayer graphene/hBN moiré lattices |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2403.14393 |