Quantum transport in periodically modulated electron waveguides

ORAL

Abstract

Recent experiments on nanowires written on LAO/STO interfaces have shown their conductive properties are highly controllable and display a range of interesting physics. For example, it has been observed that these display quantized conductance. New experiments apply a periodic potential in the nanowire, displaying a fracturing of the lowest transconductance peak and a 2e^2/h first peak that is not split by magnetic fields up to 16T. We present theoretical descriptions of how these features occur. We first study how the single-particle features change under a periodic potential modulation, and show that this can fracture the transconductance peak. Additionally, we consider that the modulations engineer a spin-orbit coupling, and we study its effect on the single particle regime. Finally, to describe the conductance plateau of 2e^2/h, we introduce electron-electron interactions, and show that the engineered spin-orbit coupling enhances the interactions and leads to a pairing of the lowest energy spin-subbands.

*UoS: EPSRC Programme Grant DesOEQ (EP/P009565/1); EOARD via AFOSR number FA9550-18-1-0064
UoP: Vannevar Bush Faculty Fellowship (N00014-15-1-2847); National Science Foundation (PHY-1913034)
UoW-M: DOE Office of Basic Energy Sciences number DE-FG02-06ER46327

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Presenters

  • Elliott Mansfield

    • University of Strathclyde

Authors

  • Elliott Mansfield

    • University of Strathclyde

  • François Damanet

    • University of Strathclyde

  • Andrew Daley

    • University of Strathclyde

  • Megan K Briggeman

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

  • Patrick R Irvin

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

  • Jeremy Levy

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

  • Hyungwoo Lee

    • Materials Science and Engineering, University of Wisconsin-Madison
    • University of Wisconsin-Madison
    • University of Wisconsin-Maddison
    • Department of Materials Science and Engineering, University of Wisconsin-Madison

  • Jungwoo Lee

    • Materials Science and Engineering, University of Wisconsin-Madison
    • University of Wisconsin, Madison
    • Department of Materials Science and Engineering, University of Wisconsin-Madison,, University of Wisconsin
    • University of Wisconsin-Madison
    • University of Wisconsin-Maddison
    • Department of Materials Science and Engineering, University of Wisconsin-Madison

  • Kitae Eom

    • Materials Science and Engineering, University of Wisconsin-Madison
    • Department of Materials Science and Engineering, University of Wisconsin-Maddison
    • Department of Materials Science and Engineering, University of Wisconsin
    • Department of Materials Science Engineering, University of Wisconsin-Madison
    • Department of Materials Science and Engineering, University of Wisconsin-Madison,, University of Wisconsin
    • Material Science and Engineering, University of Wisconsin-Madison
    • University of Wisconsin-Madison
    • University of Wisconsin-Maddison

  • Chang-Beom Eom

    • Materials Science and Engineering, University of Wisconsin-Madison
    • University of Wisconsin, Madison
    • Department of Materials Science and Engineering, University of Wisconsin-Maddison
    • Department of Materials Science and Engineering, University of Wisconsin
    • Department of Materials Science Engineering, University of Wisconsin-Madison
    • Department of Materials Science and Engineering, University of Wisconsin-Madison,, University of Wisconsin
    • Material Science and Engineering, University of Wisconsin-Madison
    • University of Wisconsin-Madison
    • University of Wisconsin-Maddison
    • University of Wisconsin - Madison
    • University of Wisconsin Madison
    • Department of Materials Science and Engineering, University of Wisconsin-Madison

  • Jianan Li

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

  • Mengchen Huang

    • University of Pittsburgh