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Electrical control of Kondo effect and superconducting transport in a side-gated InAs quantum dot Josephson junction

机译:侧门InAs量子点约瑟夫森结中近藤效应和超导输运的电控制

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摘要

We measure the nondissipative supercurrent in a single InAs self-assembled quantum dot (QD) coupled to superconducting leads. The QD occupation is both tuned by a back-gate electrode and lateral side gate. The geometry of the side gate allows tuning of the QD-lead tunnel coupling in a region of constant electron number with an appropriate orbital state. Using the side-gate effect we study the interplay between Kondo correlations and superconducting pairing on the QD, observing a decrease in the supercurrent when the Kondo temperature is reduced below the superconducting energy gap in qualitative agreement with theoretical predictions.
机译:我们在耦合到超导引线的单个InAs自组装量子点(QD)中测量非耗散超电流。 QD占用都通过背栅电极和侧向栅极进行调整。侧门的几何形状允许在具有适当轨道状态的恒定电子数区域内调节QD-铅隧道耦合。利用侧门效应,我们研究了量子点相关性与超导对在量子点上的相互作用,观察到当近藤温度降低到超导能隙以下时,与理论预测定性一致的情况下,超电流的减小。

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  • 来源
    《Physical review》 |2010年第5期|P.054512.1-054512.8|共8页
  • 作者单位

    Department of Applied Physics and QPEC, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku 113-8656, Japan;

    rnDepartment of Applied Physics and QPEC, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku 113-8656, Japan;

    rnDepartment of Applied Physics and QPEC, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku 113-8656, Japan Quantum Spin Information Project, ICORP, JST, Atsugi-shi, Kanagawa 243-0198, Japan JST CREST, 4-1-8 Hon-cho, Kawaguchi-shi, Saitama 332-0012, Japan;

    rnQuantum Spin Information Project, ICORP, JST, Atsugi-shi, Kanagawa 243-0198, Japan;

    rnInstitute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan;

    JST CREST, 4-1-8 Hon-cho, Kawaguchi-shi, Saitama 332-0012, Japan Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan INQ1E, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokvo 153-8505, Japan;

    rnDepartment of Applied Physics and QPEC, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku 113-8656, Japan Quantum Spin Information Project, ICORP, JST, Atsugi-shi, Kanagawa 243-0198, Japan INQ1E, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokvo 153-8505, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    proximity effects; Andreev effect; SN and SNS junctions; tunneling phenomena; point contacts, weak links, josephson effects; quantum dots; coulomb blockade; single-electron tunneling;

    机译:邻近效应;安德列夫效应;SN和SNS交界处;隧道现象;点接触;薄弱环节;约瑟夫森效应;量子点;库仑封锁;单电子隧穿;

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