Theory of amplification of sound (acoustic phonons) by absorption of laser radiation in quantum wires with parabolic potential

TL;DR

This paper develops a quantum transport model to analyze how laser radiation amplifies sound via acoustic phonons in quantum wires with parabolic potential, providing analytical expressions and numerical results.

Contribution

It introduces a theoretical framework for sound amplification in quantum wires considering monophoton and multiphoton absorption, with detailed analytical and numerical analysis.

Findings

Analytical expressions for sound absorption coefficients are derived.

Differences between monophoton and multiphoton absorption cases are discussed.

Numerical results for GaAs/GaAsAl quantum wires are presented and compared with bulk semiconductors and quantum wells.

Abstract

Based on the quantum transport equation for the electron-phonon system, the absorption coefficient of sound (acoustic phonons) by absorption of a laser radiation in quantum wires with parabolic potential is calculated for the case of monophoton absorption and the case of multiphoton absorption. Analytical expressions and conditions for the absorption coefficient of sound are obtained. Differences between the two cases of monophoton absorption and of multiphoton absorption are discussed; numerical computations and plots are carried out for a GaAs/GaAsAl quantum wire. The results are compared with bulk semiconductors and quantum wells.