Occupation-resolved conductance as a test for Kondo correlations in the mixed valence regime of few-electron quantum dots

ORAL

Abstract

We present a comparison between conductance measurements close to strongly-coupled Coulomb blockade peaks in a lithographically-defined quantum dot (QD), simultaneous charge sensing measurements of the QD occupation, and numerical renormalization group (NRG) simulations.

The measurements were carried out for QD parameters where NRG predicts Kondo correlations in the mixed-valence regime to modify both the conductance through the QD, and the entropy of the QD states. This work thereby enables a direct comparison between previous probes of the Kondo effect in QDs, dominated by conductance measurements, and a recent investigation of QD entropy in the mixed-valence Kondo regime [1].

[1] Child, Tim & Sheekey, Owen & Lüscher, Silvia & Fallahi, Saeed & Gardner, Geoffrey & Manfra, M.J. & Kleeorin, Yaakov & Meir, Yigal & Folk, Joshua. (2021). Entropy measurement of a strongly correlated quantum dot.

*Thanks to:European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme under grant agreement No 951541;Stewart Blusson Quantum Matter Institute;Natural Sciences and Engineering Research Council of Canada;Canada Foundation for Innovation;Canadian Institute for Advanced Research;

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Presenters

  • Johann Drayne

    • Physics and Astronomy, University of British Columbia
    • Stewart Blusson Quantum Matter Institute

Authors

  • Johann Drayne

    • Physics and Astronomy, University of British Columbia
    • Stewart Blusson Quantum Matter Institute

  • Tim J Child

    • Physics and Astronomy, University of British Columbia
    • University of British Columbia

  • Silvia Lüscher

    • University of British Columbia
    • Physics and Astronomy, University of British Columbia

  • Saeed Fallahi

    • Purdue University, Microsoft Quantum Purdue
    • Physics and Astronomy, Purdue University
    • Purdue University

  • Geoff C Gardner

    • Purdue University
    • Materials Engineering, Purdue University
    • Department of Physics and Astronomy, Birck Nanotechnology Center, Purdue University

  • Michael J Manfra

    • Purdue University, Microsoft Quantum Purdue
    • Purdue University
    • Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA; Microsoft Quantum Lab, Purdue University, West Lafayette, IN, USA
    • Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy, Birck Nanotechnology Center, School of Electrical and Computer Engineering and Microsoft Quantum Lab West Lafayette, Purdue University
    • Department of Physics and Astronomy and Nanotechnology Center Purdue University, Microsoft Quantum Lab West Lafayette
    • Department of Physics and Astronomy, Birck Nanotechnology Center, School of Materials Engineering and School of Electrical and Computer Engineering, Purdue University

  • Yaakov Kleeorin

    • Center for the Physics of Evolving Systems, University of Chicago
    • Ben-Gurion University of the Negev

  • Yigal Meir

    • Department of Physics, Ben-Gurion University of the Negev
    • Ben Gurion University
    • Ben-Gurion University of the Negev

  • Joshua Folk

    • University of British Columbia
    • Physics and Astronomy, University of British Columbia