Electron transport in confined oxide nanowires

ORAL

Abstract

The invention of conductive AFM lithography at the LaAlO$_3$/SrTiO$_3$ interface enables the creation of clean inter-connected oxide nanowires and artificially engineered tunnel barriers. Here we create an oxide nanowire that is confined by two tunnel barriers using this technique. Two terminal and four terminal transport studies reveal transitions among Cooper pair tunneling, Coulomb blockade and Fabry-Perot inteference that can be tuned by side gate voltages and external magnetic field. Our results indicate the presence of long-range coherence in LaAlO$_3$/SrTiO$_3$ nanowires.

*This work is supported by AFSOR FA9550-10-1-0524 (J.L and C.B.E) and DMR-0906443 (C.B.E).

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Authors

  • Guanglei Cheng

    • Department of Physics and Astronomy, University of Pittsburgh

  • Michelle Tomczyk

    • University of Pittsburgh
    • Department of Physics and Astronomy, University of Pittsburgh

  • Shicheng Lu

    • University of Pittsburgh
    • Department of Physics and Astronomy, University of Pittsburgh

  • Mengchen Huang

    • University of Pittsburgh
    • Department of Physics and Astronomy, University of Pittsburgh

  • Josh Veazey

    • Department of Physics and Astronomy, University of Pittsburgh

  • Patrick Irvin

    • University of Pittsburgh
    • Department of Physics and Astronomy, University of Pittsburgh

  • Chang-Beom Eom

    • Dept. of Materials Science and Engineering, University of Wisconsin-Madison, Wisconsin 53706, USA
    • University of Wisconsin-Madison
    • Department of Materials Sciences and Engineering, University of Wisconsin-Madison

  • Jeremy Levy

    • University of Pittsburgh
    • Department of Physics and Astronomy, University of Pittsburgh