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High mobile electron gas at LaAlO3/SrTiO3 heterointerface

Published online by Cambridge University Press:  16 February 2012

Shanshan Su  and
Jeong Ho You
Shanshan Su
Affiliation:
Department of Mechanical Engineering, Southern Methodist University, Dallas TX
Jeong Ho You
Affiliation:
Department of Mechanical Engineering, Southern Methodist University, Dallas TX
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Abstract

We calculated the mobility of two-dimensional electron gas along an n-type interface in LaAlO3/SrTiO3 heterostructure using the linearized Boltzmann equation. By solving the Schrödinger equation with the Poisson equation self-consistently, it was found that the interface remained non-conducting up to four unit cells of LaAlO3 film. For five or higher unit cells, the interface became conducting due to the significant overlap between the SrTiO3 conduction band and the LaAlO3 valence band. The electron gas was localized within 7 nm from the interface and multi-subbands were occupied. The calculated mobility matches reasonably well with available experimental data. It was found that the mobility is limited by the remote ionic charged layers in LaAlO3 at low temperature. At high temperature, the polar optical phonon was found to be the dominant scattering center.

Keywords

electrical propertiessimulationthin film
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1406: Symposium Z – Functional Metal-Oxide Nanostructures , 2012 , mrsf11-1406-z18-48
Copyright
Copyright © Materials Research Society 2012

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