Large nanoscale electronic conductivity in complex oxide heterostructures with ultra high electron density

Sara Arezoomandan, Hugo Condori Quispe, Ashish Chanana, Peng Xu, Ajay Nahata, Bharat Jalan, Berardi Sensale-Rodriguez

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Abstract

We study the two-dimensional electron gas at the interface of NdTiO3 and SrTiO3 to reveal its nanoscale transport properties. At electron densities approaching 1015 cm-2, our terahertz spectroscopy data show conductivity levels that are up to six times larger than those extracted from DC electrical measurements. Moreover, the largest conductivity enhancements are observed in samples intentionally grown with larger defect densities. This is a signature of electron transport over the characteristic length-scales typically probed by electrical measurements being significantly affected by scattering by structural defects introduced during growth, and, a trait of a much larger electron mobility at the nanoscale.

Original languageEnglish (US)
Article number076107
JournalAPL Materials
Volume4
Issue number7
DOIs
StatePublished - Jul 1 2016

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    Arezoomandan, S., Condori Quispe, H., Chanana, A., Xu, P., Nahata, A., Jalan, B., & Sensale-Rodriguez, B. (2016). Large nanoscale electronic conductivity in complex oxide heterostructures with ultra high electron density. APL Materials, 4(7), [076107]. https://doi.org/10.1063/1.4959284