Optotwistronic of bilayer graphene

Abstract

We present a study of the nonlinear optical response of twisted bilayer graphene. We discuss the contribution of the Berry phase to the non-linearity when inversion symmetry is broken, thus underlining the interplay between band and real space geometry, and nonlinear response. We also highlight an effect which is characteristic of extreme nonlinear optics: the generation of harmonics in disguise. This effect emerges in twisted bilayer graphene at relatively moderate fields strengths because of the much reduced band width. Our findings contribute to the understanding of the link between geometry and optical properties, as well as of the extreme nonlinear optical regime in twisted bilayer graphene

References in corpus (7)

• The electronic properties of bilayer graphene
• Tunable Layer Circular Photogalvanic Effect in Twisted Bilayers
• Bound on resistivity in flat-band materials due to the quantum metric
• High-order nonlinear optical response of a twisted bilayer graphene
• Effective Floquet Hamiltonians for periodically-driven twisted bilayer graphene
• Terahertz photogalvanics in twisted bilayer graphene close to the second magic angle
• Longitudinal and anomalous Hall conductivity of a general two-band model

Cited by in corpus (3)

• Zigzag edge ferromagnetism of triangular-graphene-quantum-dot-like system
• Berry curvature and shift vector effects at high-order wave mixing in biased bilayer graphene
• Tunable nonlinear excitonic optical response in biased bilayer graphene