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Higher-Order Harmonics in Hexagonal Graphene Quantum Dots

  • ELECTRONIC PROPERTIES OF SOLID
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Abstract

We have considered the high-order harmonic generation in plane graphene quantum dots of hexagonal shape by the independent quasiparticle approximation-tight binding model. We have investigated how such a nonlinear effect is affected by a strong optical wave field, quantum dot typical band gap and lateral size, and dephasing processes. The equation of motion for the density matrix is solved by performing the time integration with the eight-order Runge–Kutta algorithm. If the optical wave frequency is much less than the quantum dot intrinsic band gap, the main aspects of multiphoton high harmonic emission in quantum dots are revealed. In such case dependence of the cutoff photon energy on the strength of the optical pump wave is almost linear. But when the wave frequency is comparable to the bandgap of the quantum dot, the cutoff photon energy shows saturation behavior with an increase in the wave field strength.

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ACKNOWLEDGMENTS

The authors are deeply grateful to Prof. H.K. Avetissian and Dr. G.F. Mkrtchian for permanent discussions and valuable recommendations.

Funding

This work was supported by the Science Committee of RA in Frames of Project 20TTWS-1C010.

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Authors and Affiliations

  1. Centre of Strong Fields Physics at Physics Research Institute, Yerevan State University, 0025, Yerevan, Armenia

    Kh. V. Sedrakian, A. G. Ghazaryan, B. R. Avchyan & Q. S. Poghosyan

  2. CANDLE Synchrotron Research Institute, 0022, Yerevan, Armenia

    T. M. Markosyan

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  1. Kh. V. Sedrakian
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  2. A. G. Ghazaryan
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  3. B. R. Avchyan
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  4. Q. S. Poghosyan
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  5. T. M. Markosyan
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Correspondence to A. G. Ghazaryan.

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Sedrakian, K.V., Ghazaryan, A.G., Avchyan, B.R. et al. Higher-Order Harmonics in Hexagonal Graphene Quantum Dots. J. Exp. Theor. Phys. 137, 395–403 (2023). https://doi.org/10.1134/S1063776123090121

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