Nonlinear IV curves in twisted bilayer graphene

Owing to the flatness of the reconstructed minibands, kinetic energy in twisted bilayer graphene is quenched. Recently, non-linear current-voltage (I-V) characteristics and sharp peaks in differential resistance are observed in graphene-BN superlattices and twisted bilayer graphene away from magic angle[1] at moderate current density, which arise from the Schwinger pair production mechanism in the presence of reduced Fermi velocity. Here, by tuning twisted bilayer graphene near magic angle, we investigate the possibility of further reducing Fermi velocity and the evolution of nonlinear IV curves with strongly correlated behavior turned on.

[1] A. Berdyugin et al. arXiv:2106.12609 [cond-mat.other].