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首页> 外文期刊>Physical review >Improvement of electron pump accuracy by a potential-shape-tunable quantum dot pump
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Improvement of electron pump accuracy by a potential-shape-tunable quantum dot pump

机译：通过电位形状可调的量子点泵提高电子泵精度

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摘要

We have investigated the accuracy dependence of a single-electron pump on the confinement-potential shape of a quantum dot (QD) pump. A uniquely designed QD, which employs multiple gates to control the shape of the QD potential well, is utilized for electron pumping. It has been observed that the accuracy of the pump can be dramatically enhanced by achieving smaller QD size and greater decoupling from the electrodes, which is supported by the so-called decay-cascade model. The accuracy of the pump current is estimated, based on the decay-cascade model, to be close to 0.1 ppm for 80-pA pump current when the confinement-potential shape is optimally tuned. This is the highest reported accuracy, although it is a theoretically estimated value, among QD-based pumps measured at 4.2 K in the absence of an external magnetic field. Our numerical calculations show that the enhancement of the estimated accuracy is mainly due to the increase of the electron addition energy in the QD as well as the increase of the height and thickness of the QD potential barrier.
机译：我们已经研究了单电子泵对量子点（QD）泵的约束势能形状的精度依赖性。电子泵浦采用了独特设计的QD，它采用多个栅极来控制QD势阱的形状。已经观察到，通过实现较小的QD尺寸和与电极的更大去耦，可以显着提高泵的精度，这由所谓的衰减级联模型支持。当最佳调整约束电位形状时，基于衰减级联模型，对于80pA的泵电流，泵电流的精度估计接近0.1 ppm。在没有外部磁场的情况下，在4.2 K下测量的基于QD的泵中，尽管这是理论上的估计值，但仍是最高的报告精度。我们的数值计算表明，估计精度的提高主要是由于量子点中电子添加能的增加以及量子点势垒的高度和厚度的增加。

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  • 来源
    《Physical review》 |2014年第8期|085307.1-085307.5|共5页
  • 作者

    Minky Seo; Ye-Hwan Ann; Youngheon Oh; Yunchul Chung; Sungguen Ryu; H.-S. Sim; In-Ho Lee; Myung-Ho Bae; Nam Kim;

  • 作者单位

    Department of Physics, Pusan National University, Busan 609-735, Republic of Korea,Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea,Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea;

    Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea,Department of Physics, Korea University, Seoul 136-713, Republic of Korea;

    Department of Physics, Pusan National University, Busan 609-735, Republic of Korea;

    Department of Physics, Pusan National University, Busan 609-735, Republic of Korea;

    Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea;

    Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea;

    Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea;

    Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea;

    Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    coulomb blockade; single-electron tunneling; quantum dots;

    机译：库仑封锁;单电子隧穿量子点;

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