Engineered Helicity of One-Dimensional LaAlO<sub>3</sub>/SrTiO<sub>3</sub> Nanowires

ORAL

Abstract

Quantum transport in 1D geometries is fascinating in its own right, but it can also be regarded as a building-block for a variety of quantum devices. We have developed a flexible platform for creating 1D nanostructures at the LaAlO3/SrTiO3 interface using a conductive-AFM lithography technique [1]. Straight nanowire segments behave as electron waveguides with subband occupation that can be tuned with a gate and an external magnetic field [2]. We can periodically perturb this waveguide, with 10 nm periodicity, in two ways. “Kronig-Penney” type modulation results in periodic vertical displacement of the electron waveguide, and sinusoidal lateral displacement of the nanowire can also be achieved. Combining the two perturbations in quadrature yields a helical nanowire which exhibits striking oscillatory transmission as a function of both magnetic field and chemical potential. We discuss these results in terms of an engineered axial in-plane spin-orbit interaction within the spiral electron waveguide.

[1] Cen et al., Nature Materials 7, 298 (2008).
[2] Annadi et al., Nano Lett 18, 4473 (2018).

*JL acknowledges a Vannevar Bush Faculty Fellowship, funded by ONR (N00014-15-1-2847). C-BE acknowledges NSF DMREF (DMR-1629270), AFOSR (FA9550-15-1-0334), and AOARD (FA2386-15-1-4046).

–

Presenters

  • Megan Briggeman

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

Authors

  • Megan Briggeman

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

  • Jianan Li

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

  • Mengchen Huang

    • Department of Physics and Astronomy, University of Pittsburgh
    • Physics, University of California-Santa Barbara
    • Physics and Astronomy, University of Pittsburgh
    • University of Pittsburgh

  • Anthony Tylan-Tyler

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

  • Hyungwoo Lee

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

  • Jungwoo Lee

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

  • Chang-Beom Eom

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

  • Patrick Irvin

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

  • Jeremy Levy

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