Charge writing at the LaAlO3/SrTiO3 surface

Details Charge writing at the LaAlO3/SrTiO3 surface Charge writing at the LaAlO3/SrTiO3 surface

2010-05-21

arxiv.org/abs/1005.3872v1

Physics

Condensed Matter

Materials Science

12 pages, 4 figures, plus supplementary information, submitted to Nano Letters

Scientific paper

Biased conducting-tip atomic force microscopy (AFM) has been shown to write and erase nanoscale metallic lines at the LaAlO3/SrTiO3 interface. Using various AFM modes, we show the mechanism of conductivity switching is the writing of surface charge. These charges are stably deposited on a wide range of LaAlO3 thicknesses, including bulk crystals. A strong asymmetry with writing polarity was found for 1 and 2 unit cells of LaAlO3, providing experimental evidence for a theoretically predicted built-in potential.

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