Ultrafast strong-field absorption in gapped graphene

We study theoretically the strong-field absorption of an ultrafast optical pulse by a gapped graphene monolayer. At low field amplitudes, the absorbance in pristine graphene is equal to the universal value of 2.3%. Although the ultrafast optical absorption for low field amplitudes is independent of...

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Bibliographic Details
Published in:Physical review. B 2020-04, Vol.101 (16), p.1, Article 165433
Main Authors: Oliaei Motlagh, S. Azar, Zafar, Ahmal Jawad, Mitra, Aranyo, Apalkov, Vadym, Stockman, Mark I.
Format: Article
Language:English
Subjects:
Absorbance
Absorption
Amplitudes
Circular polarization
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Energy gap
Graphene
Linear polarization
Materials Science
Physics
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Summary:We study theoretically the strong-field absorption of an ultrafast optical pulse by a gapped graphene monolayer. At low field amplitudes, the absorbance in pristine graphene is equal to the universal value of 2.3%. Although the ultrafast optical absorption for low field amplitudes is independent of the polarization, linear or circular, of the applied optical pulse, for high field amplitudes, the absorption strongly depends on the pulse polarization. For a linearly polarized pulse, the optical absorbance is saturated at the value of ≈1.4% for the pulse's amplitude of ≥0.4V/Å, but no such saturation is observed for a circularly polarized pulse. For the gapped graphene, the absorption of a linearly polarized pulse shows a weak dependence on the bandgap, while for a circularly polarized pulse, the absorption is very sensitive to the bandgap.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.101.165433