Second-order conductivity in twisted double bilayer graphene changes sign and peaks near van Hove singularities, giving a zero-field probe of Fermi surface reconstruction and a record-high extrinsic nonlinear response.
Van Hove, The Occurrence of Singularities in the Elastic Frequency Distribution of a Crystal, Phys
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Second-Order Conductivity Probes a Cascade of Singularities in a Moir\'e Superlattice
Second-order conductivity in twisted double bilayer graphene changes sign and peaks near van Hove singularities, giving a zero-field probe of Fermi surface reconstruction and a record-high extrinsic nonlinear response.