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Electron transfer and ionic displacements at the origin of the 2D electron gas at the LAO/STO interface: directmeasurements with atomic-column spatial resolution.

Cantoni C, Gazquez J, Miletto Granozio F, Oxley MP, Varela M, Lupini AR, Pennycook SJ, Aruta C, di Uccio US, Perna P, Maccariello D.

Adv Mater. 2012 Aug 2;24(29):3952-7.

Materials Science and Technology Division, Oak Ridge National Laboratory, TN 37831-6116, USA. [email protected]

Abstract

Using state-of-the-art, aberration-corrected scanning transmission electron microscopy and electron energy loss spectroscopy with atomic-scalespatial 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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