Intense and tunable second-harmonic generation in biased bilayer graphene

Brun, Søren Jacob; Pedersen, Thomas Garm

doi:10.1103/physrevb.91.205405

Cited by 46 publications

(43 citation statements)

References 42 publications

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“…The nonzero increasing value of the conversion efficiency η(ω) at small ω < m frequencies confirms this statement. This consideration appears to be in agreement with the result of [5], and also reproduces the trend observed in [18]. Increasing the frequency of the applied light, the SHG spectrum reveals the first resonance at energies when excited electrons reach the band-gap.…”

Section: Shg Response From Massive Graphenesupporting

confidence: 90%

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Resonant optical second harmonic generation in graphene-based heterostructures

2019

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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 non-interacting tightbinding model with a mass term, which describes a non-equivalence 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 band width. The difficulty in distinguishing between SHG signals coming from the considered heterostrusture and environment (insulating substrate) can be avoided 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. arXiv:1903.06641v1 [cond-mat.mes-hall]

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Section: Shg Response From Massive Graphenesupporting

confidence: 90%

“…3. The double resonance on the band-gap was reported previously in [6], but is missing, for example, in [18].…”

Section: Shg Response From Massive Graphenementioning

confidence: 57%

Resonant optical second harmonic generation in graphene-based heterostructures

2019

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“…SHG measurement has become an efficient way to characterize the structure, symmetry, and electronic and optical properties of materials . For example, a graphene monolayer with inversion symmetry has no SHG response, i.e., the χ (2) is equal to zero . The TMD odd layers have a strong SHG due to the absence of inversion symmetry while the SHG of the TMD with even layers is removed due to the inversion symmetry .…”

Section: Characterization and Propertiesmentioning

confidence: 99%

Recent Progress of Janus 2D Transition Metal Chalcogenides: From Theory to Experiments

Cheng

Huang

2018

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Since the discovery of graphene, 2D materials with various properties have gained increasing attention in fields such as novel electronic, optic, spintronic, and valleytronic devices. As an important derivative of 2D materials, Janus 2D materials, such as Janus transition metal chalcogenides (TMDs), have become a research hot spot in recent years. Janus 2D materials with mirror asymmetry display novel properties, such as the Rashba effect and normal piezoelectric polarization, providing great promise for their application in sensors, actuators, and other electromechanical devices. Here, the current theoretical and experimental progresses made in the development of Janus 2D TMDs, including their structure and stability, electronic properties, fabrication, and the results of their characterization are reported. Finally, the future prospects for the further development of Janus 2D materials are considered.

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“…In previous studies, 35,76 the authors addressed the quadratic response of non-centrosymmetric honeycomb lattices in the regime where transitions between the top valence and bottom conduction bands dominate. Here, we focus on the regime where the chemical potential is significantly larger than the band gap µ E g .…”

Section: Response Of Gapped Graphenementioning

confidence: 99%

“…Nonetheless, it remains comparable to the estimates of SHG in BBG. 35 Therefore, SHG should be detectable in commensurate structures of graphene on SiC or hBN, and also tuneable by doping. Similar results are found for the OR process, where the magnitude of the response at large doping is comparable to that of BBG in the same energy range.…”

Section: Response Of Gapped Graphenementioning

confidence: 99%

Nonlinear optical response of doped monolayer and bilayer graphene: Length gauge tight-binding model

2018

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We compute the nonlinear optical response of doped mono-and bilayer graphene using the full dispersion based on tight-binding models. The response is derived with the density matrix formalism using the length gauge and is valid for any periodic system, with arbitrary doping. By collecting terms that define effective nonlinear response tensors, we identify all nonlinear Drude-like terms (up to third-order) and show that all additional spurious divergences present in the induced current vanish. The nonlinear response of graphene comprises a large Drude-like divergence and three resonances that are tightly connected with transitions occurring in the vicinity of the Fermi level. The analytic solution derived using the Dirac approximation captures accurately the firstand third-order responses in graphene, even at very high doping levels. The quadratic response of gapped graphene is also strongly enhanced by doping, even for systems with small gaps such as commensurate structures of graphene on SiC. The nonlinear response of bilayer graphene is significantly richer, combining the resonances that stem from doping with its intrinsic strong low-energy resonances.

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Intense and tunable second-harmonic generation in biased bilayer graphene

Cited by 46 publications

References 42 publications

Resonant optical second harmonic generation in graphene-based heterostructures

Resonant optical second harmonic generation in graphene-based heterostructures

Recent Progress of Janus 2D Transition Metal Chalcogenides: From Theory to Experiments

Nonlinear optical response of doped monolayer and bilayer graphene: Length gauge tight-binding model

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