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  • 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.

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.

Advanced materials (Deerfield Beach, Fla.) (2012-06-20)
Claudia Cantoni, Jaume Gazquez, Fabio Miletto Granozio, Mark P Oxley, Maria Varela, Andrew R Lupini, Stephen J Pennycook, Carmela Aruta, Umberto Scotti di Uccio, Paolo Perna, Davide Maccariello
PMID22711448
ABSTRACT

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.