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Título
Theory of high-order harmonic generation for gapless graphene
Autor(es)
Materia
Graphene
High order harmonic generation
Intense fields
Two-dimensional systems
Fecha de publicación
2018-05
Citación
Zurrón-Cifuentes, O., Picón, A., & Plaja, L. (2018). Theory of high-order harmonic generation for gapless graphene. New Journal of Physics, 20, 053033. https://doi.org/10.1088/1367-2630/aabec7
Resumen
[EN]We study the high-harmonic spectrum emitted by a single-layer graphene, irradiated by an ultrashort intense infrared laser pulse. We show the emergence of the typical non-perturbative spectral features, harmonic plateau and cut-off, for mid-infrared driving fields, at fluences below the damage threshold. In contrast to previous works, using THz drivings, we demonstrate that the harmonic cut-off frequency saturates with the intensity. Our results are derived from the numerical integration of the time-dependent Schrödinger equation using a nearest neighbor tight-binding description of graphene. We also develop a saddle-point analysis that reveals a mechanism for harmonic emission in graphene different from that reported in atoms, molecules and finite gap solids. In graphene, the first step is initiated by the non-diabatic crossing of the valence band electron trajectories through the Dirac points, instead of tunneling ionization/excitation. We include a complete identification of the trajectories contributing to any particular high harmonic and reproduce the harmonic cut-off scaling with the driving intensity.
URI
DOI
10.1088/1367-2630/aabec7
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