Engineered Helicity of One-Dimensional LaAlO3/SrTiO3 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).

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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