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Defects in quantum ring to control high-harmonic spectrum

Published online by Cambridge University Press:  23 January 2017

E. Fiordilino  and
B. Frusteri
E. Fiordilino
Affiliation:
Dipartimento di Fisica e Chimica, Università degli Studi Palermo, Via Archirafi 36, 90123, Palermo, Italy
B. Frusteri*
Affiliation:
Dipartimento di Fisica e Chimica, Università degli Studi Palermo, Via Archirafi 36, 90123, Palermo, Italy
*
Address correspondence and reprint requests to: B. Frusteri, Dipartimento di Fisica e Chimica, Università degli Studi Palermo, Via Archirafi 36, 90123, Palermo, Italy. E-mail: biagio.frusteri@unipa.it
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Abstract

The high-harmonic generation from a structured quantum ring (SQR) driven by an intense laser field is presented within the single active electron approximation. The spectrum is studied by varying the symmetry of the physical system. The standard SQR (six identical and equidistant dots in a ring) presents a 60° rotational symmetry, that in this work is broken, moving or changing only one potential hole. We find that careful designed breaking of the geometrical symmetry of the SQR opens the possibility of controlling the characteristics of the harmonic lines such as intensity and polarization. HHG analysis of the emission spectrum performed through a Morlet wavelet, shows that the high-frequency emission occurs during short time intervals.

Keywords

Electron dynamicsHigh-harmonic generationIntense laserQuantum ringTime-resolved spectroscopy
Type
Research Article
Information
Laser and Particle Beams , Volume 35 , Issue 1 , March 2017 , pp. 126 - 136
Copyright
Copyright © Cambridge University Press 2017 

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