Role of intraband transitions in photocarrier generation

Role of intraband transitions in photocarrier generation

We theoretically investigate the role of intraband transitions in laser-induced carrier generation for different photon energy regimes: (i) strongly off resonant, (ii) multiphoton resonant, and (iii) resonant conditions. Based on the analysis for the strongly off resonant and multiphoton resonant ca...

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Veröffentlicht in:Physical review. B 2018-07, Vol.98 (3), p.035202, Article 035202
Hauptverfasser: Sato, Shunsuke A., Lucchini, Matteo, Volkov, Mikhail, Schlaepfer, Fabian, Gallmann, Lukas, Keller, Ursula, Rubio, Angel
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Excitation
Lasers
Multiphoton absorption
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container_issue 3
container_start_page 035202
container_title Physical review. B
container_volume 98
creator Sato, Shunsuke A.
Lucchini, Matteo
Volkov, Mikhail
Schlaepfer, Fabian
Gallmann, Lukas
Keller, Ursula
Rubio, Angel
description We theoretically investigate the role of intraband transitions in laser-induced carrier generation for different photon energy regimes: (i) strongly off resonant, (ii) multiphoton resonant, and (iii) resonant conditions. Based on the analysis for the strongly off resonant and multiphoton resonant cases, we find that intraband transitions strongly enhance photocarrier generation in both multiphoton absorption and tunneling excitation regimes, and thus, they are indispensable for describing the nonlinear photocarrier generation processes. Furthermore, we find that intraband transitions enhance photocarrier generation even in the resonant condition, opening additional multiphoton excitation channels once the laser irradiation becomes sufficiently strong. The above findings suggest a potential for efficient control of photocarrier generation via multicolor laser pulses through optimization of the contributions from intraband transitions.
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Lasers
Multiphoton absorption
title Role of intraband transitions in photocarrier generation
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