Anomalous plateau formation and improved quantization in charge pumping under the application of a perpendicular magnetic field

ORAL

Abstract

We present experimental results of high frequency quantized charge pumping through a quantum dot formed by the electric field arising from applied voltages in a GaAs/AlGaAs system in the presence of a perpendicular magnetic field $B$. Improved quantization and robustness in gate voltage are seen as $B$ is increased. Under application of even higher $B$ fields, the formation of anomalous plateaus in the pumped current are seen.

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Authors

  • Samuel Wright

    Cavendish Lab, Cambridge, Cavendish Laboratory and Toshiba Cambridge Research Laboratory

  • Mark Blumenthal

    Cavendish Lab, Cambridge, Cavendish Laboratory and National Physical Laboratory

  • Godfrey Gumbs

    Hunter College/CUNY, Hunter College of CUNY, Hunter College of the City University of New York

  • Adam Thorn

    University of Cambridge, UK, Cavendish Laboratory

  • M. Pepper

    Cavendish Lab, Cambridge, University of Cambridge, UK, Cavendish Laboratory, Cavendish Laboratory, University of Cambridge

  • T.J.B.M. Janssen

    National Physical Laboratory

  • Stuart Holmes

    Toshiba Cambridge Research Laboratory

  • Dave Anderson

    University of Cambridge, UK, Cavendish Laboratory

  • Geb Jones

    University of Cambridge, UK, Cavendish Laboratory

  • C.A. Nicoll

    Cavendish Laboratory, Cavendish Laboratory, University of Cambridge

  • D.A. Ritchie

    University of Cambridge, UK, Cavendish Laboratory, Cavendish Laboratory, University of Cambridge