Deterministic fabrication of graphene hexagonal boron nitride moiré superlattices
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| Autores principales: | , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866915218100060160 |
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| author | Kamat, Rupini V. Sharpe, Aaron L. Pendharkar, Mihir Hu, Jenny Tran, Steven J. Zaborski Jr., Gregory Hocking, Marisa Finney, Joe Watanabe, Kenji Taniguchi, Takashi Kastner, Marc A. Mannix, Andrew J. Heinz, Tony Goldhaber-Gordon, David |
| author_facet | Kamat, Rupini V. Sharpe, Aaron L. Pendharkar, Mihir Hu, Jenny Tran, Steven J. Zaborski Jr., Gregory Hocking, Marisa Finney, Joe Watanabe, Kenji Taniguchi, Takashi Kastner, Marc A. Mannix, Andrew J. Heinz, Tony Goldhaber-Gordon, David |
| contents | The electronic properties of moiré heterostructures depend sensitively on the relative orientation between layers of the stack. For example, near-magic-angle twisted bilayer graphene (TBG) commonly shows superconductivity, yet a TBG sample with one of the graphene layers rotationally aligned to a hexagonal Boron Nitride (hBN) cladding layer provided the first experimental observation of orbital ferromagnetism. To create samples with aligned graphene/hBN, researchers often align edges of exfoliated flakes that appear straight in optical micrographs. However, graphene or hBN can cleave along either zig-zag or armchair lattice directions, introducing a 30 degree ambiguity in the relative orientation of two flakes. By characterizing the crystal lattice orientation of exfoliated flakes prior to stacking using Raman and second-harmonic generation for graphene and hBN, respectively, we unambiguously align monolayer graphene to hBN at a near-0 degree, not 30 degree, relative twist angle. We confirm this alignment by torsional force microscopy (TFM) of the graphene/hBN moiré on an open-face stack, and then by cryogenic transport measurements, after full encapsulation with a second, non-aligned hBN layer. This work demonstrates a key step toward systematically exploring the effects of the relative twist angle between dissimilar materials within moiré heterostructures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_18588 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Deterministic fabrication of graphene hexagonal boron nitride moiré superlattices Kamat, Rupini V. Sharpe, Aaron L. Pendharkar, Mihir Hu, Jenny Tran, Steven J. Zaborski Jr., Gregory Hocking, Marisa Finney, Joe Watanabe, Kenji Taniguchi, Takashi Kastner, Marc A. Mannix, Andrew J. Heinz, Tony Goldhaber-Gordon, David Mesoscale and Nanoscale Physics The electronic properties of moiré heterostructures depend sensitively on the relative orientation between layers of the stack. For example, near-magic-angle twisted bilayer graphene (TBG) commonly shows superconductivity, yet a TBG sample with one of the graphene layers rotationally aligned to a hexagonal Boron Nitride (hBN) cladding layer provided the first experimental observation of orbital ferromagnetism. To create samples with aligned graphene/hBN, researchers often align edges of exfoliated flakes that appear straight in optical micrographs. However, graphene or hBN can cleave along either zig-zag or armchair lattice directions, introducing a 30 degree ambiguity in the relative orientation of two flakes. By characterizing the crystal lattice orientation of exfoliated flakes prior to stacking using Raman and second-harmonic generation for graphene and hBN, respectively, we unambiguously align monolayer graphene to hBN at a near-0 degree, not 30 degree, relative twist angle. We confirm this alignment by torsional force microscopy (TFM) of the graphene/hBN moiré on an open-face stack, and then by cryogenic transport measurements, after full encapsulation with a second, non-aligned hBN layer. This work demonstrates a key step toward systematically exploring the effects of the relative twist angle between dissimilar materials within moiré heterostructures. |
| title | Deterministic fabrication of graphene hexagonal boron nitride moiré superlattices |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2405.18588 |