Nonlinear optical study of commensurability effects in graphene-hBN heterostructures

Abstract

Second-order nonlinear optical response allows to detect different properties of the system associated with the inversion symmetry breaking. Here, we use a second harmonic generation effect to investigate the alignment of a graphene/hexagonal Boron Nitride heterostructure. To achieve that, we activate a commensurate-incommensurate phase transition by a thermal annealing of the sample. We find that this structural change in the system can be directly observed through a strong modification of a nonlinear optical signal. This result reveals the potential of a second harmonic generation technique for probing structural properties of layered systems.

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Cited by in corpus (8)

• Engineering symmetry breaking in two-dimensional layered materials
• Nonlinear twistoptics at symmetry-broken interfaces
• Parametric Nonlinear Optics with Layered Materials and Related Heterostructures
• Gauge invariance and Ward identities in nonlinear response theory
• Second harmonic generation due to spatial structure of radiation beam
• Second harmonic generation at the edge of a two-dimensional electron gas
• On dielectric screening in twisted double bilayer graphene
• Hexagonal boron nitride/bilayer graphene moiré superlattices in the Dirac-material family: energy-band engineering and carrier doping by dual gating