Abstract

Impurity-induced absorption of light in quantum wires in the presence of external collinear electric and magnetic fields directed perpendicular to the nanowire axis is studied theoretically. The dopants in the quantum wire are modeled by a zero-radius potential. Expressions governing the light absorption coefficient are derived, and specificities of impurity light absorption are studied for all possible directions of polarization of the light wave. In particular, some of optical transitions that are forbidden in the absence of fields become allowed in the presence of external fields. Frequency dependences of light-absorption coefficient, along with the influence of electric and magnetic fields on the magnitude of absorption induced by impurities, are investigated. The possibility of controlling optical characteristics of nanowires by means of an electric field is demonstrated.

中文翻译：

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外部电场和磁场中掺杂纳米线的光学特性

摘要

理论上研究了在垂直于纳米线轴的外部共线电场和磁场的存在下，杂质在量子线中引起的光吸收。量子线中的掺杂物通过零半径电势建模。推导了控制光吸收系数的表达式，并研究了光波所有可能的偏振方向上杂质光吸收的特异性。特别地，在存在外场的情况下，允许在不存在场的情况下被禁止的某些光学跃迁。研究了光吸收系数的频率依赖性，以及电场和磁场对杂质引起的吸收幅度的影响。