Creation of high mobility two-dimensional electron gases via strain induced polarization at an otherwise nonpolar complex oxide interface

Yunzhong Chen; Felix Trier; Takeshi Kasama; Dennis V. Christensen; Nicolas Bovet; Han Li; Zoltan I. Balogh; Karl T. S. Thydén; Wei Zhang; Sadegh Yazdi; Poul Norby; Nini Pryds; Søren Linderoth

doi:10.1021/nl504622w

Creation of high mobility two-dimensional electron gases via strain induced polarization at an otherwise nonpolar complex oxide interface

Materials Science 2015-02-24 v1

Authors: Yunzhong Chen , Felix Trier , Takeshi Kasama , Dennis V. Christensen , Nicolas Bovet , Han Li , Zoltan I. Balogh , Karl T. S. Thydén , Wei Zhang , Sadegh Yazdi , Poul Norby , Nini Pryds , Søren Linderoth

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Abstract

The discovery of two-dimensional electron gases (2DEGs) in SrTiO3-based heterostructures provides new opportunities for nanoelectronics. Herein, we create a new type of oxide 2DEG by the epitaxial-strain-induced polarization at an otherwise nonpolar perovskite-type interface of CaZrO3/SrTiO3. Remarkably, this heterointerface is atomically sharp, and exhibits a high electron mobility exceeding 60,000 cm2V-1s-1 at low temperatures. The 2DEG carrier density exhibits a critical dependence on the film thickness, in good agreement with the polarization induced 2DEG scheme.

Keywords

two-dimensional electron gas oxide heterostructure epitaxial strain polarization nonpolar interface electron mobility CaZrO3/SrTiO3

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@article{arxiv.1502.06364,
  title  = {Creation of high mobility two-dimensional electron gases via strain induced polarization at an otherwise nonpolar complex oxide interface},
  author = {Yunzhong Chen and Felix Trier and Takeshi Kasama and Dennis V. Christensen and Nicolas Bovet and Han Li and Zoltan I. Balogh and Karl T. S. Thydén and Wei Zhang and Sadegh Yazdi and Poul Norby and Nini Pryds and Søren Linderoth},
  journal= {arXiv preprint arXiv:1502.06364},
  year   = {2015}
}

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19 pages, 4 figs; Nano Letters,2015, published online

Creation of high mobility two-dimensional electron gases via strain induced polarization at an otherwise nonpolar complex oxide interface

Abstract

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