Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101765
Title: Resonant optical second harmonic generation in graphene-based heterostructures
Authors: Vandelli, M.
Katsnelson, M. I.
Stepanov, E. A.
Issue Date: 2019
Publisher: American Physical Society
Citation: Vandelli M. Resonant optical second harmonic generation in graphene-based heterostructures / M. Vandelli, M. I. Katsnelson, E. A. Stepanov. — DOI 10.1103/PhysRevB.99.165432 // Physical Review B. — 2019. — Vol. 99. — Iss. 16. — 165432.
Abstract: An optical second-harmonic generation (SHG) allows to probe various structural and symmetry-related properties of materials, since it is sensitive to the inversion symmetry breaking in the system. Here, we investigate the SHG response from a single layer of graphene disposed on an insulating hexagonal boron nitride (hBN) and silicon carbide (SiC) substrates. The considered systems are described by a noninteracting tight-binding model with a mass term, which describes a nonequivalence of two sublattices of graphene when the latter is placed on a substrate. The resulting SHG signal linearly depends on the degree of the inversion symmetry breaking (value of the mass term) and reveals several resonances associated with the band gap, van Hove singularity, and bandwidth. The difficulty in distinguishing between SHG signals coming from the considered heterostructure and environment (insulating substrate) can be avoided by applying a homogeneous magnetic field. The latter creates Landau levels in the energy spectrum and leads to multiple resonances in the SHG spectrum. Position of these resonances explicitly depends on the value of the mass term. We show that at energies below the band gap of the substrate the SHG signal from the massive graphene becomes resonant at physically relevant values of the applied magnetic field, while the SHG response from the environment stays off resonant. © 2019 American Physical Society.
Keywords: BORON CARBIDE
ENERGY GAP
GRAPHENE
III-V SEMICONDUCTORS
MAGNETIC FIELDS
NONLINEAR OPTICS
RESONANCE
SILICON CARBIDE
SUBSTRATES
APPLIED MAGNETIC FIELDS
HEXAGONAL BORON NITRIDE (H-BN)
HOMOGENEOUS MAGNETIC FIELD
INSULATING SUBSTRATES
OPTICAL SECOND-HARMONIC GENERATION
SILICON CARBIDES (SIC)
TIGHT BINDING MODEL
VAN HOVE SINGULARITIES
HARMONIC GENERATION
URI: http://hdl.handle.net/10995/101765
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85065466611
PURE ID: 9817070
0b5dc946-8361-4487-b376-079e6e812979
ISSN: 24699950
DOI: 10.1103/PhysRevB.99.165432
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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