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Proceedings Paper

Strong-field-driven dynamics and high-harmonic generation in interacting 1D systems (Conference Presentation)
Author(s): Sandra de Vega; Joel D. Cox; Fernando Sols; Javier Garcia de Abajo

Paper Abstract

The observation of higher-order harmonic generation (HHG) from bulk crystals has stimulated significant efforts to understand the involved mechanisms and their analogue to the intuitive three-step recollision model of gas phase HHG. On the technological side, efficient solid-state HHG is anticipated to enable compact attosecond and ultraviolet light sources that could unveil electron dynamics in chemical reactions and provide sharper tomographic imaging of molecular orbitals. Here we explore the roles of electronic band structure and Coulomb interactions in solid-state HHG by studying the optical response of linear atomic chains to intense ultrashort pulses. Specifically, we simulate electron dynamics in monoatomic chains by solving the single-particle density matrix equation of motion, incorporating tight-binding electronic states and a self-consistent electron-electron interaction, in the presence of intense ultrafast optical fields. While linear atomic chains constitute an idealized system, our realistic 1D model readily provides insight related to the time-evolution of electronic states in reciprocal space, both in the absence or presence of electron interactions, which we demonstrate to play an important role in the HHG yield. Our findings apply directly to extreme nonlinear optical phenomena in atoms on surfaces, linear arrays of dopant atoms in semiconductors, and linear molecules, such as polycyclic aromatic hydrocarbon chains, and can be straightforwardly extended to optimize existing or identify new solid-state platforms for HHG.

Paper Details

Date Published: 9 September 2019
Proc. SPIE 11085, Low-Dimensional Materials and Devices 2019, 1108504 (9 September 2019); doi: 10.1117/12.2529209
Show Author Affiliations
Sandra de Vega, ICFO - Institut de Ciències Fotòniques (Spain)
Joel D. Cox, ICFO - Institut de Ciències Fotòniques (Spain)
Fernando Sols, Univ. Complutense de Madrid (Spain)
Javier Garcia de Abajo, ICFO - Institut de Ciències Fotòniques (Spain)
ICREA - Institució Catalana de Recerca i Estudis Avançats (Spain)

Published in SPIE Proceedings Vol. 11085:
Low-Dimensional Materials and Devices 2019
Nobuhiko P. Kobayashi; A. Alec Talin; Albert V. Davydov, Editor(s)

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