Two-dimensional electron gas in a modulation-doped SrTiO3/Sr(Ti,Zr)O3 heterostructure

Adam P. Kajdos; Daniel G. Ouellette; Tyler A. Cain; Susanne Stemmer

doi:10.1063/1.4819203

Two-dimensional electron gas in a modulation-doped SrTiO3/Sr(Ti,Zr)O3 heterostructure

Mesoscale and Nanoscale Physics 2013-11-05 v2 Materials Science

Authors: Adam P. Kajdos , Daniel G. Ouellette , Tyler A. Cain , Susanne Stemmer

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Abstract

A two-dimensional electron gas (2DEG) in SrTiO3 is created via modulation doping by interfacing undoped SrTiO3 with a wider-band-gap material, SrTi1-xZrxO3, that is doped n-type with La. All layers are grown using hybrid molecular beam epitaxy. Using magnetoresistance measurements, we show that electrons are transferred into the SrTiO3, and a 2DEG is formed. In particular, Shubnikov-de Haas oscillations are shown to depend only on the perpendicular magnetic field. Experimental Shubnikov-de Haas oscillations are compared with calculations that assume multiple occupied subbands.

Keywords

two-dimensional electron gas modulation doping SrTiO3 heterostructure Shubnikov-de Haas oscillations magnetoresistance molecular beam epitaxy

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@article{arxiv.1307.4361,
  title  = {Two-dimensional electron gas in a modulation-doped SrTiO3/Sr(Ti,Zr)O3 heterostructure},
  author = {Adam P. Kajdos and Daniel G. Ouellette and Tyler A. Cain and Susanne Stemmer},
  journal= {arXiv preprint arXiv:1307.4361},
  year   = {2013}
}

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Submitted to Applied Physics Letters

Two-dimensional electron gas in a modulation-doped SrTiO3/Sr(Ti,Zr)O3 heterostructure

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