Parallel electron-hole bilayer conductivity from electronic interface reconstruction: Experiment

ORAL

Abstract

Electronic reconstruction at polar interfaces is the change in electronic properties to compensate an otherwise diverging electric potential. For the perovskite oxide SrTiO$_3$-LaAlO$_3 $ model system we show that an additional capping SrTiO$_3$ layer prevents structural or chemical reconstruction at the LaAlO$_3$ surface and provides a possibility to accommodate holes. Magnetotransport, scanning tunneling microscopy and in situ ultraviolet photoelectron spectroscopy provide evidence for electronic reconstruction and for the presence of two spatially separated sheets with electron and hole carriers, that are as close as 1 nm, forming an excitingly versatile system to realize and study 2D excitonic phenomena.

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Authors

  • Alexander Brinkman

    MESA+ Institute for Nanotechnology, University of Twente, The Netherlands

  • Mark Huijben

    University of Twente, MESA+ Institute for Nanotechnology, University of Twente, The Netherlands

  • Josee Kleibeuker

    MESA+ Institute for Nanotechnology, University of Twente, The Netherlands

  • Jeroen Huijben

    MESA+ Institute for Nanotechnology, University of Twente, The Netherlands

  • Hans Boschker

    MESA+ Institute for Nanotechnology, University of Twente, The Netherlands

  • Daan Kockmann

    MESA+ Institute for Nanotechnology, University of Twente, The Netherlands

  • Wolter Siemons

    UC Berkeley - Dep. of Physics, MESA+ institute for nanotechnology, University of Twente, The Netherlands, MESA+ Institute for Nanotechnology, University of Twente, The Netherlands

  • Gert Koster

    MESA+ institute for nanotechnology, University of Twente, The Netherlands, MESA+ Institute for Nanotechnology, University of Twente, The Netherlands

  • Harold Zandvliet

    MESA+ Institute for Nanotechnology, University of Twente, The Netherlands

  • Guus Rijnders

    MESA+ Institute for Nanotechnology, University of Twente, The Netherlands

  • Dave Blank

    MESA+ institute for nanotechnology, University of Twente, The Netherlands, MESA+ Institute for Nanotechnology, University of Twente, The Netherlands

  • Hans Hilgenkamp

    MESA+ Institute for Nanotechnology, University of Twente, The Netherlands