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理论物理通讯：英文版

Effects of Electron-Phonon Interaction on Linear and Nonlinear Optical Absorption in Cylindrical Quantum Wires

Y.-Y. YU, Youbin

Published Jan 1, 2008• 2 citations
OpenAlex

Abstract

对在有一个无限的限制潜力的圆柱的量电线(CQW ) 中的线性、非线性的光吸收的电子声子相互作用影响被调查。光吸收系数被使用 compact-density-matrix 途径和反复的方法获得，并且数字结果为 GaAs CQW 被介绍。结果证明电子声子相互作用在 CQW 在光吸收上做不同影响。电子的波浪功能上的电子声子相互作用统治吸收系数的价值，电子的精力上的电子声子效果的修正让吸收山峰蓝色变并且变得更宽。而且，对有一个无限的限制潜力的光吸收的电子声子相互作用影响与一个有限限制潜力与那不同。

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对在有一个无限的限制潜力的圆柱的量电线(CQW ) 中的线性、非线性的光吸收的电子声子相互作用影响被调查。光吸收系数被使用 compact-density-matrix 途径和反复的方法获得，并且数字结果为 GaAs CQW 被介绍。结果证明电子声子相互作用在 CQW 在光吸收上做不同影响。电子的波浪功能上的电子声子相互作用统治吸收系数的价值，电子的精力上的电子声子效果的修正让吸收山峰蓝色变并且变得更宽。而且，对有一个无限的限制潜力的光吸收的电子声子相互作用影响与一个有限限制潜力与那不同。
The electron-phonon interaction influences on linear and nonlinear optical absorption in cylindrical quantum wires (CQW) with an infinite confining potential are investigated. The optical absorption coefficients are obtained by using the compact-density-matrix approach and iterative method, and the numerical results are presented for GaAs CQW. The results show that the electron-phonon interaction makes a distinct influence on optical absorption in CQW. The electron-phonon interaction on the wave functions of electron dominates the values of absorption coefficients and the correction of the electron-phonon effect on the energies of the electron makes the absorption peaks blue shift and become wider. Moreover, the electron-phonon interaction influence on optical absorption with an infinite confining potential is different from that with a finite confining potential.
The optical absorptions coefficients with considering the electron-phonon interaction were theoretically studied in square tangent quantum wells.The wave functions and energy levels are described in square tangent quantum wells by perturbation theory when the polaron effects were considered,and analytic expression for the linear and the third-order nonlinear optical absorption coefficients was obtained by the compact density-matrix method and the iterative procedure.The numerical results for typical GaAs/AlGaAs material showed that the electron-phonon interaction had great influence on the linear,nonlinear and total optical absorption,meanwhile the absorption saturation phenomenon was more obvious than the one without considering the polaron effects.Moreover,the changes of the total optical absorptions increased with the well width b decreasing or the well depth V0 increasing when the electron-phonon interaction was considered.
The influence of electron–phonon interaction on third-harmonic generation in cylindrical quantum wires are investigated. The third-harmonic generation coefficient is obtained using compact-density-matrix approach and iterative method, and the numerical results are presented for GaAs cylindrical quantum wires. The results show that the third-harmonic generation coefficient is greatly enhanced after taking into consideration the influence of electron–phonon interaction. It is about thirty times larger than that obtained by just considering electron states when electron–phonon resonance is met.