Electron Transfer and Ionic Displacements at the Origin of the 2D Electron Gas at the LAO/STO Interface: Direct Measurements with Atomic-Column Spatial Resolution

Authors

  • Claudia Cantoni,

    Corresponding author
    1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6116, USA
    • Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6116, USA.
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  • Jaume Gazquez,

    1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6116, USA
    2. Universidad Complutense de Madrid, Madrid 28040, Spain
    Current affiliation:
    1. Institut de Ciencia de Materials de Barcelona ICMAB-CSIC
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  • Fabio Miletto Granozio,

    1. Dipartimento di Scienze Fisiche and CNR-SPIN, Universitá di Napoli “Federico II”, Compl. Univ. di Monte S. Angelo, Via Cintia, I-80126 Napoli, Italy
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  • Mark P. Oxley,

    1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6116, USA
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  • Maria Varela,

    1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6116, USA
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  • Andrew R. Lupini,

    1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6116, USA
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  • Stephen J. Pennycook,

    1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6116, USA
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  • Carmela Aruta,

    1. Dipartimento di Scienze Fisiche and CNR-SPIN, Universitá di Napoli “Federico II”, Compl. Univ. di Monte S. Angelo, Via Cintia, I-80126 Napoli, Italy
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  • Umberto Scotti di Uccio,

    1. Dipartimento di Scienze Fisiche and CNR-SPIN, Universitá di Napoli “Federico II”, Compl. Univ. di Monte S. Angelo, Via Cintia, I-80126 Napoli, Italy
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  • Paolo Perna,

    1. Dipartimento di Scienze Fisiche and CNR-SPIN, Universitá di Napoli “Federico II”, Compl. Univ. di Monte S. Angelo, Via Cintia, I-80126 Napoli, Italy
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  • Davide Maccariello

    1. Dipartimento di Scienze Fisiche and CNR-SPIN, Universitá di Napoli “Federico II”, Compl. Univ. di Monte S. Angelo, Via Cintia, I-80126 Napoli, Italy
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Abstract

original image

Using state-of-the-art, aberration-corrected scanning transmission electron microscopy and electron energy loss spectroscopy with atomic-scale spatial resolution, experimental evidence for an intrinsic electronic reconstruction at the LAO/STO interface is shown. Simultaneous measurements of interfacial electron density and system polarization are crucial for establishing the highly debated origin of the 2D electron gas.

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