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引用本文格式: She Yan-Chao,Zhang Wei-Xi,Li Yong,Xiao Zheng-Guo. Nonlinear Faraday rotation in a single semiconductor quantum dot with phonon-assisted transition [J]. J. At. Mol. Phys., 2019, 36: 621 (in Chinese) [佘彦超,张蔚曦,李勇,肖政国. 计及声子辅助跃迁的单量子点中的非线性法拉第偏转 [J]. 原子与分子物理学报, 2019, 36: 621]
 
计及声子辅助跃迁的单量子点中的非线性法拉第偏转
Nonlinear Faraday rotation in a single semiconductor quantum dot with phonon-assisted transition
摘要点击 109  全文点击 30  投稿时间:2018-08-17  修订日期:2018-09-17
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DOI编号   
中文关键词   声子辅助跃迁  电磁感应透明  法拉第偏转  半导体量子点
英文关键词   phonon-assisted transition  electromagnetically induced transparency  Faraday Rotation    semiconductor quantum dot
基金项目   国家自然科学基金
作者单位E-mail
佘彦超 铜仁学院物理与电子工程系 sheyanchao316@163.com 
张蔚曦 铜仁学院物理与电子工程系 zhangwwxx@sina.com 
李勇 铜仁学院物理与电子工程系 likaiyong6@163.com 
肖政国 铜仁学院物理与电子工程系 xiaozhengguo513@163.com 
中文摘要
    利用一束弱线性 π偏振探测光在与其平行的磁场作用下所形成的两偏振分量,在半导体单量子点中考虑声子辅助跃迁去构建环形四能级电磁感应透明介质模型。利用多重尺度法,解析研究发现:仅考虑系统的线性效应, 随着耦合光强度的增加,介质对探测光的吸收迅速减少,形成透明窗口,并且透明窗口的宽度随之增大;进一步地,在相同的外加磁场下探测光的非线性法拉第偏转方向与线性法拉第偏转相反,且偏转角更大。随着声子辅助跃迁强度的增加,线性和非线性法拉第偏转角都会逐渐变小,并且非线性法拉第偏转角减小的更多。这说明系统中的声子辅助跃迁能有效地调制探测光的法拉第偏转。我们的研究可能对于弱光条件下的光信息处理和传输具有潜在的应用价值。
英文摘要
    In this paper, with considering that a weak, π-linear-polarized probe field can form left- and right-polarized components under the control of the parallel magnetic field, a theory model of the four-level type semiconductor quantum dot system under the mechanism of electromagnetically induced transparency (EIT) is proposed.The linear optical absorption properties and Faraday rotation in this system are analytically studied with the phonon-assisted transition (PAT). By using the multiple-scale method, it is found the absorption of the probe optical field decreases rapidly to form a electromagnetically induced transparency (EIT) window, and the width of the EIT window becomes wider with the strength of the coupling field increasing. Meanwhile,the results shown that for the same magnetic field the nonlinear Faraday rotation direction is opposite to linear Faraday rotation, and its rotation angle grows bigger than that of linear Faraday rotation.Furthermore, we found that both of the nonlinear and linear rotation angle decreased and the nonlinear one decreased faster with the strength of PAT increasing. These results mean that the Faraday rotation of the single quantum dot can be controlled by the PAT effect.

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