High harmonic generation in undoped graphene: Interplay of inter- and intraband dynamics

We develop a density-matrix formalism in the length gauge to calculate the nonlinear response of intrinsic monolayer graphene at terahertz frequencies. Employing a tight-binding model, we find that the interplay of the interband and intraband dynamics leads to strong harmonic generation at moderate...

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Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-12, Vol.90 (24), Article 245423
Main Authors: Al-Naib, Ibraheem, Sipe, J. E., Dignam, Marc M.
Format: Article
Language:English
Subjects:
Amplitudes
Condensed matter
Formalism
Graphene
Harmonic generations
Harmonics
Nonlinear dynamics
Terahertz frequencies
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description We develop a density-matrix formalism in the length gauge to calculate the nonlinear response of intrinsic monolayer graphene at terahertz frequencies. Employing a tight-binding model, we find that the interplay of the interband and intraband dynamics leads to strong harmonic generation at moderate field amplitudes. In particular, we find that at low temperature, the reflected field of undoped suspended graphene exhibits a third harmonic amplitude that is 32% of the fundamental for an incident field of 100 V/cm. Moreover, we find that up to the seventh harmonic and beyond are generated.
doi_str_mv 10.1103/PhysRevB.90.245423
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source American Physical Society:Jisc Collections:APS Read and Publish 2023-2025 (reading list)
subjects Amplitudes
Condensed matter
Formalism
Graphene
Harmonic generations
Harmonics
Nonlinear dynamics
Terahertz frequencies
title High harmonic generation in undoped graphene: Interplay of inter- and intraband dynamics
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