Nonlinear electrical transport unveils Fermi surface malleability in a moiré heterostructure
arXiv:2408.08644 · doi:10.1021/acs.nanolett.4c01946
Abstract
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.
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Cited by in corpus (7)
- Detecting Lifshitz Transitions Using Nonlinear Conductivity in Bilayer Graphene
- Intrinsic nonlinear Nernst and Seebeck effect
- Quantum geometric moment encodes stacking order of moiré matter
- Nonlinear bulk photocurrent probe Z2 topological phase transition
- Planar Nernst effect from hidden band geometry in layered two-dimensional materials
- Second-Order Conductivity Probes a Cascade of Singularities in a Moiré Superlattice
- Band Geometry Induced Third-Harmonic Generation