Nanoscale Inhomogeneous Energy Landscape in LaAlO3/SrTiO3 Heterostructures

ORAL

Abstract

The energy landscape of LaAlO3/SrTiO3 (LAO/STO) heterostructures plays an important role in determining the transport phenomena. An inhomogeneous energy landscape can lead to the breakdown of 2D transport and the emergence of 1D transport. Thus, knowledge of the energy landscape of the system can play a significant role in understanding correlated electron systems. Here we report a minimally invasive probing technique to map the energy landscape of LAO/STO heterostructures. Using conductive atomic force microscope (c-AFM) lithography [1], we write nanoscale cross-shaped electron waveguides, or “nanocrosses”. Low temperature magnetotransport measurements reveal signs of spatial inhomogeneity. Anisotropic magnetoconductance and anomalous Hall resistance also indicate inhomogeneity. The nanocross geometry provides a powerful tool for exploring the energy landscape of the system and its implications under one frame.

[1] C. Cen, et al., Nature Materials 7, 298 (2008).

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Presenters

  • Aditi Nethwewala

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

Authors

  • Aditi Nethwewala

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

  • 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

  • Yuhe Tang

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