Theory of the SrTiO3 Surface State Two-Dimensional Electron Gas

Guru Khalsa; A. H. MacDonald

doi:10.1103/PhysRevB.86.125121

Theory of the SrTiO3 Surface State Two-Dimensional Electron Gas

Strongly Correlated Electrons 2013-05-30 v1

Authors: Guru Khalsa , A. H. MacDonald

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Abstract

We present a theory of the quasi two-dimensional electron gas (2DEG) systems which appear near the surface of SrTiO $_3$ when a large external electric field attracts carriers to the surface. We find that non-linear and non-local screening by the strongly polarizable SrTiO $_3$ lattice plays an essential role in determining 2DEG properties. The electronic structure always includes weakly bound bulk-like bands that extend over many SrTiO $_3$ layers. At 2D carrier-densities exceeding $\sim 10^{14} {\rm cm}^{-2}$ tightly bound bands emerge that are confined within a few layers of the surface.

Keywords

two-dimensional electron gas SrTiO3 surface state screening electronic structure bulk-like bands

Cite

@article{arxiv.1205.4362,
  title  = {Theory of the SrTiO3 Surface State Two-Dimensional Electron Gas},
  author = {Guru Khalsa and A. H. MacDonald},
  journal= {arXiv preprint arXiv:1205.4362},
  year   = {2013}
}

Comments

10 pages, 9 figures, 1 table

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