APS Logo

Coupling Quantum Dots to 2DEG-Based Superconductor-Semiconductor Hybrids

ORAL

Abstract

We present experimental results for gate-defined lateral quantum dots coupled to a superconductor-semiconductor nanowire based on InAs/Al two-dimensional electron gas (2DEG). We demonstrate independent voltage control of coupling of multiple quantum dots to the superconducting wire on one side and normal semiconducting leads on the other. This provides experimental control of hybridization of discrete dot states to subgap Andreev states in the wire [1,2] and a tool for high-resolution spectroscopy of Andreev states [3], as well as a possibility to use the dots as filters [4]. A high degree of experimental control as well as extension to a variety of device geometries is made possible by the hybrid 2DEG platform.

[1] D. Clarke, Phys. Rev. B 96, 201109(R) (2017)

[2] E. Prada et al, Phys. Rev. B 96, 085418 (2017)

[3] F. Thomas et al, Phys. Rev. B 104, 115415 (2021)

[4] G. Wang, T. Dvir et al, arXiv:2110.05373 (2021)

–

Presenters

  • Alisa Danilenko

    Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark, Univ of Copenhagen

Authors

  • Alisa Danilenko

    Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark, Univ of Copenhagen

  • Andreas S Pöschl

    Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark

  • Deividas Sabonis

    ETH Zurich, Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark, Laboratory for Solid State Physics, ETH Zürich

  • Tyler Lindemann

    Department of Physics and Astronomy, Birck Nanotechnology Center, and Microsoft Quantum Lab Purdue, Purdue University, Purdue University, Microsoft Quantum Materials Lab-Purdue, West Lafayette, Indiana 47907, USA, Purdue University

  • Sergei Gronin

    Purdue University, Microsoft Quantum Materials Lab-Purdue, West Lafayette, Indiana 47907, USA, Microsoft Quantum Materials Lab-Purdue, Purdue University

  • Geoffrey C Gardner

    Purdue University, Purdue University, Microsoft Quantum Materials Lab-Purdue, West Lafayette, Indiana 47907, USA), Microsoft Quantum Materials Lab-Purdue

  • Candice Thomas

    Purdue University, Purdue University, Microsoft Quantum Materials Lab-Purdue, West Lafayette, Indiana 47907, USA, CEA

  • Michael J Manfra

    Department of Physics and Astronomy, Birck Nanotechnology Center, and Microsoft Quantum Lab Purdue, Purdue University, Purdue University, Purdue University, West Lafayette, Indiana 47907, USA

  • Charles M Marcus

    Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Copenhagen Denmark., Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark, Univ of Copenhagen