Dopant-Free Single Electron Pumps for Quantum Metrology

ORAL

Abstract

At low temperature, we have observed low-disorder quantized conductance in quantum wires fabricated in dopant-free GaAs/AlGaAs two-dimensional electron gases (2DEG) with mobilities up to 7x106 cm2/Vs (at 2.9x1011 /cm2), with a 1D subband energy level spacing that can be tuned from 1 meV to more than 5 meV on individual devices. The absence of (intentional) dopants produces an environment with ultra low disorder [1] and very little charge noise [2]. Single electron pumps [3,4] were fabricated and measured at 1 GHz, with up to 3 quantized current plateaus observed. Thus, dopant-free quantum wires provide a unique platform to investigate electron-electron interactions, and could offer a path towards single electron pumps suitable for a quantum current standard [5].

[1] S. Sarkozy et al., PRB 79, 161307(R) (2009)
[2] W. Y. Mak et al., APL 102, 103507 (2013)
[3] S. P. Giblin et al., Nat. Comm. 3, 930 (2012)
[4] N. Ubbelohde et al., Nat. Nanotech. 10, 46 (2015)
[5] N. H. Kaneko et al., Meas. Sci. Technol. 27, 032001 (2016)

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Presenters

  • Francois Sfigakis

    Institute for Quantum Computing, University of Waterloo, Waterloo, Canada, Institute for Quantum Computing, University of Waterloo, University of Waterloo

Authors

  • Francois Sfigakis

    Institute for Quantum Computing, University of Waterloo, Waterloo, Canada, Institute for Quantum Computing, University of Waterloo, University of Waterloo

  • Brandon Buonacorsi

    Institute for Quantum Computing, University of Waterloo, Waterloo, Canada

  • Arjun Shetty

    Institute for Quantum Computing, University of Waterloo, Institute for Quantum Computing, University of Waterloo, Waterloo, Canada

  • Chris Deimert

    Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Canada

  • Alan Tam

    Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Canada

  • HoSung Kim

    Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Canada

  • Zbig Wasilewski

    Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Canada

  • Niels Ubbelohde

    Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany

  • Frank Hohls

    Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany

  • Jonathan D Baugh

    Institute for Quantum Computing, University of Waterloo, Canada, Institute for Quantum Computing, University of Waterloo, Waterloo, Canada, Institute for Quantum Computing, University of Waterloo, University of Waterloo