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

doi:10.1063/1.4959284

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 language	English (US)
Article number	076107
Journal	APL Materials
Volume	4
Issue number	7
DOIs	https://doi.org/10.1063/1.4959284
State	Published - Jul 1 2016

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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.",

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AU - Arezoomandan, Sara

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AU - Xu, Peng

AU - Nahata, Ajay

AU - Jalan, Bharat

AU - Sensale-Rodriguez, Berardi

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AB - 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.

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

Abstract

Bibliographical note

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MRSEC IRG-1: Electrostatic Control of Materials

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

Abstract

Bibliographical note

How much support was provided by MRSEC?

Reporting period for MRSEC

Access

OpenUrl availability

Other files and links

Fingerprint

Projects

MRSEC IRG-1: Electrostatic Control of Materials

MRSEC Program

Cite this