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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2408.08644 |
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| _version_ | 1866914914021408768 |
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| author | Datta, Suvronil Bhowmik, Saisab Varshney, Harsh Watanabe, Kenji Taniguchi, Takashi Agarwal, Amit Chandni, U. |
| author_facet | Datta, Suvronil Bhowmik, Saisab Varshney, Harsh Watanabe, Kenji Taniguchi, Takashi Agarwal, Amit Chandni, U. |
| contents | Van Hove singularities enhance many-body interactions and induce collective states of matter ranging from superconductivity to magnetism. In magic-angle twisted bilayer graphene, van Hove singularities appear at low energies and are malleable with density, leading to a sequence of Lifshitz transitions and resets observable in Hall measurements. However, without a magnetic field, linear transport measurements have limited sensitivity to the band's topology. Here, we utilize nonlinear longitudinal and transverse transport measurements to probe these unique features in twisted bilayer graphene at zero magnetic field. We demonstrate that the nonlinear responses, induced by the Berry curvature dipole and extrinsic scattering processes, intricately map the Fermi surface reconstructions at various fillings. Importantly, our experiments highlight the intrinsic connection of these features with the moiré bands. Beyond corroborating the insights from linear Hall measurements, our findings establish nonlinear transport as a pivotal tool for probing band topology and correlated phenomena. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_08644 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Nonlinear electrical transport unveils Fermi surface malleability in a moiré heterostructure Datta, Suvronil Bhowmik, Saisab Varshney, Harsh Watanabe, Kenji Taniguchi, Takashi Agarwal, Amit Chandni, U. Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons Van Hove singularities enhance many-body interactions and induce collective states of matter ranging from superconductivity to magnetism. In magic-angle twisted bilayer graphene, van Hove singularities appear at low energies and are malleable with density, leading to a sequence of Lifshitz transitions and resets observable in Hall measurements. However, without a magnetic field, linear transport measurements have limited sensitivity to the band's topology. Here, we utilize nonlinear longitudinal and transverse transport measurements to probe these unique features in twisted bilayer graphene at zero magnetic field. We demonstrate that the nonlinear responses, induced by the Berry curvature dipole and extrinsic scattering processes, intricately map the Fermi surface reconstructions at various fillings. Importantly, our experiments highlight the intrinsic connection of these features with the moiré bands. Beyond corroborating the insights from linear Hall measurements, our findings establish nonlinear transport as a pivotal tool for probing band topology and correlated phenomena. |
| title | Nonlinear electrical transport unveils Fermi surface malleability in a moiré heterostructure |
| topic | Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2408.08644 |