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)

*This research was undertaken thanks in part to funding from NSERC, Defence Research and Development Canada (DRDC), the Canada First Research Excellence Fund, and the University of Waterloo’s Quantum NanoFab facility.

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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