Charge Writing at the LaAlO3/SrTiO3 surface.
basic_science · Level V
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- Record sourced from PubMed, PMID 20518539.
- Also identified by DOI 10.1021/nl1012695.
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Abstract
Biased conducting-tip atomic force microscopy (AFM) has been shown to write and erase nanoscale metallic lines at the LaAlO(3)/SrTiO(3) 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 LaAlO(3) thicknesses, including bulk crystals. A strong asymmetry with writing polarity was found for 1 and 2 unit cells of LaAlO(3), providing experimental evidence for a theoretically predicted built-in potential.