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Lee, Jun Hee
Quantum Materials for Energy Conversion Lab.
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Strain effects on the electronic properties in delta-doped oxide superlattices

Author(s)
You, Jeong HoLee, JunHeeOkamoto, SatoshiCooper, ValentinoLee, Ho Nyung
Issued Date
2015-03
DOI
10.1088/0022-3727/48/8/085303
URI
https://scholarworks.unist.ac.kr/handle/201301/18596
Citation
JOURNAL OF PHYSICS D-APPLIED PHYSICS, v.48, no.8, pp.085303
Abstract
Strain effects on the electronic properties of (LaTiO3)(1)/(SrTiO3)(N) superlattices were investigated using density functional theory. Under biaxial in-plane strain within the range of -5% <= epsilon(//) <= 5%, the d(xy) orbital electrons are highly localized at the interfaces whereas the d(yz) and d(xz) orbital electrons are more distributed in the SrTiO3 (STO) spacer layers. For STO thickness N >= 3 unit cells (u.c.), the dxy orbital electrons form two-dimensional (2D) electron gases (2DEGs). The quantized energy levels of the 2DEG are insensitive to the STO spacer thickness, but are strongly dependent on the applied biaxial in-plane strain. As the in-plane strain changes from compressive to tensile, the quantized energy levels of the dxy orbitals decrease thereby creating more states with 2D character. In contrast to the d(xy) orbital, the d(yz) and d(xz) orbitals always have three-dimensional (3D) transport characteristics and their energy levels increase as the strain changes from compressive to tensile. Since the charge densities in the d(xy) orbital and the d(yz) and d(xz) orbitals respond to biaxial in-plane strain in an opposite way, the transport dimensionality of the majority carriers can be controlled between 2D and 3D by applying biaxial in-plane strain
Publisher
IOP PUBLISHING LTD
ISSN
0022-3727
Keyword (Author)
oxide superlatticeLTO/STO heterostructureelectronic reconstruction
Keyword
THERMOELECTRIC SEEBECK COEFFICIENTAUGMENTED-WAVE METHODLAALO3/SRTIO3 INTERFACESUPERCONDUCTIVITYCOEXISTENCEGAS

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