Strain effects on the electronic properties in δ -doped oxide superlattices

You, Jeong Ho; Lee, Jun Hee; Okamoto, Satoshi; Cooper, Valentino; Lee, Ho Nyung

doi:10.1088/0022-3727/48/8/085303

Title: Strain effects on the electronic properties in δ -doped oxide superlattices

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Abstract

We investigated strain effects on the electronic properties of (LaTiO₃)₁/(SrTiO₃)N superlattices using density functional theory. Under biaxial in-plane strain within the range of -5% ≤ _ε// ≤ 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 d_xy 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 dxz orbitals always have three-dimensional (3D) transport characteristics and their energy levels increase as the strain changes from compressive to tensile. In conclusion, since the charge densities in the d_xyorbital 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.

Authors:

You, Jeong Ho ^[1]; Lee, Jun Hee ^[2]; Okamoto, Satoshi ^[2]; Cooper, Valentino ^[2]; Lee, Ho Nyung ^[2]

Southern Methodist Univ., Dallas, TX (United States). Dept. of Mechanical Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division

Publication Date:: Sat Feb 07 00:00:00 EST 2015

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1185729

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Physics. D, Applied Physics

Additional Journal Information:: Journal Volume: 48; Journal Issue: 8; Journal ID: ISSN 0022-3727

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; oxide superlattice; LTO/STO heterostructure; electronic reconstruction

Citation Formats


                    You, Jeong Ho, Lee, Jun Hee, Okamoto, Satoshi, Cooper, Valentino, and Lee, Ho Nyung. Strain effects on the electronic properties in δ -doped oxide superlattices.  United States: N. p., 2015. 
Web.  doi:10.1088/0022-3727/48/8/085303.

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                    You, Jeong Ho, Lee, Jun Hee, Okamoto, Satoshi, Cooper, Valentino, & Lee, Ho Nyung. Strain effects on the electronic properties in δ -doped oxide superlattices.  United States.  https://doi.org/10.1088/0022-3727/48/8/085303

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                    You, Jeong Ho, Lee, Jun Hee, Okamoto, Satoshi, Cooper, Valentino, and Lee, Ho Nyung. Sat .  
"Strain effects on the electronic properties in δ -doped oxide superlattices".  United States.  https://doi.org/10.1088/0022-3727/48/8/085303.  https://www.osti.gov/servlets/purl/1185729.

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@article{osti_1185729,

  title        = {Strain effects on the electronic properties in δ -doped oxide superlattices},

  author       = {You, Jeong Ho and Lee, Jun Hee and Okamoto, Satoshi and Cooper, Valentino and Lee, Ho Nyung},

  abstractNote = {We investigated strain effects on the electronic properties of (LaTiO3)1/(SrTiO3)N superlattices using density functional theory. Under biaxial in-plane strain within the range of -5% ≤ ε// ≤ 5%, the dxy orbital electrons are highly localized at the interfaces whereas the dyz and dxz 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 dxy orbital, the dyz and dxz orbitals always have three-dimensional (3D) transport characteristics and their energy levels increase as the strain changes from compressive to tensile. In conclusion, since the charge densities in the dxy orbital and the dyz and dxz 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.},

  doi          = {10.1088/0022-3727/48/8/085303},

  journal      = {Journal of Physics. D, Applied Physics},

  number       = 8,

  volume       = 48,

  place        = {United States},

  year         = {Sat Feb 07 00:00:00 EST 2015},

  month        = {Sat Feb 07 00:00:00 EST 2015}

}

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