Mapping the twist angle dependence of quasi-Brillouin zones in doubly aligned graphene/BN heterostructures
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909863673593856 |
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| author | Bustamante, Jorge Vallejo Nguyen, Viet-Hung Farrar, Liam S. Watanabe, Kenji Taniguchi, Takashi Mailly, Dominique Charlier, Jean-Christophe Ribeiro-Palau, Rebeca |
| author_facet | Bustamante, Jorge Vallejo Nguyen, Viet-Hung Farrar, Liam S. Watanabe, Kenji Taniguchi, Takashi Mailly, Dominique Charlier, Jean-Christophe Ribeiro-Palau, Rebeca |
| contents | When monolayer graphene is crystallographically aligned to hexagonal boron nitride (BN), a moiré superlattice is formed, producing characteristic satellite Dirac peaks in the electronic band structure. Aligning a second BN layer to graphene creates two coexisting moiré patterns, which can interfere to produce periodic, quasi-periodic or non-periodic superlattices, depending on their relative alignment. Here, we investigate one of the simplest realizations of such a double-moiré structure, graphene encapsulated between two BN layers, using dynamically rotatable van der Waals heterostructures. Our setup allows \textit{in situ} control of the top BN alignment while keeping the bottom BN fixed. By systematically mapping the charge transport as a function of BN angular alignment, we identify the simultaneous signatures of the original moirés, super-moirés, and a third set of features corresponding to quasi-Brillouin zones (qBZ) formed when the system's periodicity becomes ill-defined. Comparing our measurements with theoretical models, we provide the first experimental mapping of the qBZs as a function of angular alignment. Our results establish a direct experimental link between moiré interference and qBZ formation, opening new avenues for engineering electronic structures in multi-aligned 2D heterostructures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_19369 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Mapping the twist angle dependence of quasi-Brillouin zones in doubly aligned graphene/BN heterostructures Bustamante, Jorge Vallejo Nguyen, Viet-Hung Farrar, Liam S. Watanabe, Kenji Taniguchi, Takashi Mailly, Dominique Charlier, Jean-Christophe Ribeiro-Palau, Rebeca Mesoscale and Nanoscale Physics When monolayer graphene is crystallographically aligned to hexagonal boron nitride (BN), a moiré superlattice is formed, producing characteristic satellite Dirac peaks in the electronic band structure. Aligning a second BN layer to graphene creates two coexisting moiré patterns, which can interfere to produce periodic, quasi-periodic or non-periodic superlattices, depending on their relative alignment. Here, we investigate one of the simplest realizations of such a double-moiré structure, graphene encapsulated between two BN layers, using dynamically rotatable van der Waals heterostructures. Our setup allows \textit{in situ} control of the top BN alignment while keeping the bottom BN fixed. By systematically mapping the charge transport as a function of BN angular alignment, we identify the simultaneous signatures of the original moirés, super-moirés, and a third set of features corresponding to quasi-Brillouin zones (qBZ) formed when the system's periodicity becomes ill-defined. Comparing our measurements with theoretical models, we provide the first experimental mapping of the qBZs as a function of angular alignment. Our results establish a direct experimental link between moiré interference and qBZ formation, opening new avenues for engineering electronic structures in multi-aligned 2D heterostructures. |
| title | Mapping the twist angle dependence of quasi-Brillouin zones in doubly aligned graphene/BN heterostructures |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2510.19369 |