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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)

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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