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Anisotropic two-dimensional electron gas at the LaAlO3/SrTiO3 (110) interface

Author

Listed:
  • A. Annadi

    (NUSNNI-Nanocore, National University of Singapore
    National University of Singapore)

  • Q. Zhang

    (Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology
    Computational Condensed Matter Physics Laboratory, RIKEN ASI
    CREST, Japan Science and Technology Agency)

  • X. Renshaw Wang

    (NUSNNI-Nanocore, National University of Singapore
    National University of Singapore)

  • N. Tuzla

    (Chalmers University of Technology)

  • K. Gopinadhan

    (NUSNNI-Nanocore, National University of Singapore
    National University of Singapore)

  • W. M. Lü

    (NUSNNI-Nanocore, National University of Singapore
    National University of Singapore)

  • A. Roy Barman

    (NUSNNI-Nanocore, National University of Singapore
    National University of Singapore)

  • Z. Q. Liu

    (NUSNNI-Nanocore, National University of Singapore
    National University of Singapore)

  • A. Srivastava

    (NUSNNI-Nanocore, National University of Singapore
    National University of Singapore)

  • S. Saha

    (NUSNNI-Nanocore, National University of Singapore
    National University of Singapore)

  • Y. L. Zhao

    (NUSNNI-Nanocore, National University of Singapore
    National University of Singapore)

  • S. W. Zeng

    (NUSNNI-Nanocore, National University of Singapore
    National University of Singapore)

  • S. Dhar

    (NUSNNI-Nanocore, National University of Singapore
    National University of Singapore)

  • E. Olsson

    (Chalmers University of Technology)

  • B. Gu

    (CREST, Japan Science and Technology Agency
    Advanced Science Research Center, Japan Atomic Energy Agency)

  • S. Yunoki

    (Computational Condensed Matter Physics Laboratory, RIKEN ASI
    CREST, Japan Science and Technology Agency
    Computational Materials Science Research Team, RIKEN AICS
    Computational Quantum Matter Research Team, RIKEN CEMS)

  • S. Maekawa

    (CREST, Japan Science and Technology Agency
    Advanced Science Research Center, Japan Atomic Energy Agency)

  • H. Hilgenkamp

    (MESA+Institute for Nanotechnology, University of Twente
    Leiden Institute of Physics, Leiden University)

  • T. Venkatesan

    (NUSNNI-Nanocore, National University of Singapore
    National University of Singapore
    National University of Singapore)

  • Ariando

    (NUSNNI-Nanocore, National University of Singapore
    National University of Singapore)

Abstract

The observation of a high-mobility two-dimensional electron gas between two insulating complex oxides, especially LaAlO3/SrTiO3, has enhanced the potential of oxides for electronics. The occurrence of this conductivity is believed to be driven by polarization discontinuity, leading to an electronic reconstruction. In this scenario, the crystal orientation has an important role and no conductivity would be expected, for example, for the interface between LaAlO3 and (110)-oriented SrTiO3, which should not have a polarization discontinuity. Here we report the observation of unexpected conductivity at the LaAlO3/SrTiO3 interface prepared on (110)-oriented SrTiO3, with a LaAlO3-layer thickness-dependent metal-insulator transition. Density functional theory calculation reveals that electronic reconstruction, and thus conductivity, is still possible at this (110) interface by considering the energetically favourable (110) interface structure, that is, buckled TiO2/LaO, in which the polarization discontinuity is still present. The conductivity was further found to be strongly anisotropic along the different crystallographic directions with potential for anisotropic superconductivity and magnetism, leading to possible new physics and applications.

Suggested Citation

  • A. Annadi & Q. Zhang & X. Renshaw Wang & N. Tuzla & K. Gopinadhan & W. M. Lü & A. Roy Barman & Z. Q. Liu & A. Srivastava & S. Saha & Y. L. Zhao & S. W. Zeng & S. Dhar & E. Olsson & B. Gu & S. Yunoki &, 2013. "Anisotropic two-dimensional electron gas at the LaAlO3/SrTiO3 (110) interface," Nature Communications, Nature, vol. 4(1), pages 1-7, June.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2804
    DOI: 10.1038/ncomms2804
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    Cited by:

    1. Eli Gerber & Steven B. Torrisi & Sara Shabani & Eric Seewald & Jordan Pack & Jennifer E. Hoffman & Cory R. Dean & Abhay N. Pasupathy & Eun-Ah Kim, 2023. "High-throughput ab initio design of atomic interfaces using InterMatch," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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