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首页> 外文期刊>Journal of Applied Physics >Terahertz photo-generated current in a two-dimensional quantum dot system
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Terahertz photo-generated current in a two-dimensional quantum dot system

机译：二维量子点系统中的太赫兹照片产生电流

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摘要

The photo-generated current due to electronic transitions in a semiconductor planar quantum dot attached to outgoing leads is theoretically investigated. An electron is confined in the dot by a pure quantum mechanical effect, which is due to the higher ground state energy of the quantum wells forming the leads, as compared to the one in the dot. The dynamics of such a confined electron interacting with a light pulse is investigated by numerically solving a time-dependent Schrodinger equation within the effective mass approximation and goes beyond the lowest order perturbative approach. Our results show the coexistence of both linear and non-linear contributions to the photo-generated current in this system, sharply peaked at frequencies in the terahertz range, which are further tunable by the quantum dot radius. The peaks can be made even sharper as one adds a narrow constriction in the dot-leads connection. The details of the dependence of the peaks' frequency, intensity, and sharpness on system parameters are discussed.
机译：理论上研究了所连接到输出引线的半导体平面量子点中的电子转换引起的光产生电流。通过纯量子机械效应将电子限制在点中，这是由于与点中的孔形成引线的量子阱的较高的接地状态能量。通过在有效质量近似内的时间依赖的施罗德格方程来研究这种与光脉冲相互作用的这种密闭电子相互作用的动态，并且超出了最低扰动方法。我们的结果表明，线性和非线性贡献的共存在该系统中的光电生成电流，在太赫兹范围内的频率急剧达到峰值，其通过量子点半径进一步调谐。峰值可以使峰值更清晰，因为在点引导连接中增加了狭窄的收缩。讨论了峰值频率，强度和系统参数锐度的依赖性的细节。

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  • 来源
    《Journal of Applied Physics》 |2020年第18期|185702.1-185702.8|共8页
  • 作者

    R. Rodrigues Oliveira; D. R. da Costa; C. A. Farias; R. Ferreira; A. Chaves;

  • 作者单位

    Departamento de Fisica Universidade Federal do Ceara Caixa Postal 6030 60455-760 Fortaleza Ceara Brazil;

    Departamento de Fisica Universidade Federal do Ceara Caixa Postal 6030 60455-760 Fortaleza Ceara Brazil Department of Electrical and Computer Engineering University of Minnesota 200 Union Street SE 4-174 Keller Hall Minneapolis Minnesota 55455-0170 USA;

    Departamento de Fisica Universidade Federal do Ceara Caixa Postal 6030 60455-760 Fortaleza Ceara Brazil;

    Laboratoire de Physique de I'Ecole Normale Superieure ENS Universite PSL CNRS Sorbonne Universite Universite de Paris 75005 Paris France;

    Departamento de Fisica Universidade Federal do Ceara Caixa Postal 6030 60455-760 Fortaleza Ceara Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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