Towards quantum criticality in Al/InAs Kondo systems

ORAL

Abstract

Hybrid metal-semiconductor two-dimensional systems are an attractive platform for exploring correlated electron-electron interactions. Flexible nanopatterning allows design of structures to emulate particular Hamiltonians with electrostatically tunable parameters. Pierre et al. recently demonstrated a quantum phase transition based on a charge Kondo effect[1]. Based in a GaAs heterostructure, the metal was an annealed ohmic contact, requiring much effort to obtain a highly-transparent interface even for a few-micron metal island. InAs may offer significant advantages: pinning of the surface Fermi level in the conduction band allows for direct electrical contact to metals. For example, in-situ epitaxy of aluminum on InAs has resulted in pristine interfaces, leveraged to probe topological superconductivity[2]. Small metallic islands with large charging energies may allow building on earlier charge Kondo work without requiring as low electron temperatures. I will present our initial efforts towards realizing charge Kondo devices on InAs 2DEGs tuned into the quantum Hall regime, with edge states controlled by lithographically defined QPCs.
[1] Z. Iftikhar, et al. Nature 526, 233–236 (2015)
[2] A. Fornieri, et al. Nature 569, 89–92 (2019)

*Supported by US DoE, contract DE-AC02-76SF00515

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Presenters

  • Praveen Sriram

    • Department of Applied Physics, Stanford University

Authors

  • Praveen Sriram

    • Department of Applied Physics, Stanford University

  • Connie Hsueh

    • Department of Applied Physics, Stanford University
    • Stanford Univ

  • Asbjorn Drachmann

    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices, Microsoft Quantum Lab – Copenhagen and Niels Bohr Institute, University of Copenhagen

  • Candice Thomas

    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University
    • Microsoft Quantum at Station Q Purdue
    • Department of Physics and Astronomy and Birck Nanotechnology Center, Purdue University
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Purdue University
    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA

  • Geoffrey C. Gardner

    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University
    • Microsoft Quantum at Station Q Purdue
    • Materials Engineering, Purdue University
    • Purdue University
    • Microsoft Quantum at Station Q Purdue, Purdue University

  • Tiantian Wang

    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy and Birck Nanotechnology Center, Purdue University

  • Sergei Gronin

    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University
    • Microsoft Quantum at Station Q Purdue
    • Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907, USA
    • Microsoft Quantum Purdue

  • Michael Manfra

    • Physics and Astronomy, Purdue Univ
    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, School of Materials Engineering, School of Electrical and Computer Engineering, Purdue
    • Purdue Univ
    • Purdue University
    • Microsoft Quantum at Station Q Purdue
    • Department of Physics and Astronomy, Birck Nanotechnology Center, Microsoft Quantum Purdue, School og Materials Engineering & School of Electrical and Computer Engineering, P
    • Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA
    • Department of Physics and Astronomy, PURDUE UNIVERSITY
    • Department of Physics and Astronomy, Microsoft Quantum Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
    • Physics, Purdue University

  • Charles Marcus

    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Microsoft Quantum Lab--Copenhagen, Niels Bohr Institute, University of Copenhagen

  • David Goldhaber-Gordon

    • Stanford Univ
    • Physics, Stanford University
    • Stanford
    • Department of Physics, Stanford University