Structure and Correlation Effects in Semiconducting SrTiO$_{3}$

Young Jun Chang; Aaron Bostwick; Yong Su Kim; Karsten Horn; Eli Rotenberg

doi:10.1103/PhysRevB.81.235109

Structure and Correlation Effects in Semiconducting SrTiO$_{3}$

Materials Science 2011-03-15 v2 Strongly Correlated Electrons

Authors: Young Jun Chang , Aaron Bostwick , Yong Su Kim , Karsten Horn , Eli Rotenberg

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Abstract

We have investigated the effects of structure change and electron correlation on SrTiO $_{3}$ single crystals using angle-resolved photoemission spectroscopy. We show that the cubic to tetragonal phase transition at 105 $^\circ$ K is manifested by a charge transfer from in-plane ( $d_{yz}$ and $d_{zx}$ ) bands to out-of-plane ( $d_{xy}$ ) band, which is opposite to the theoretical predictions. Along this second-order phase transition, we find a smooth evolution of the quasiparticle strength and effective masses. The in-plane band exhibits a peak-dip-hump lineshape, indicating a high degree of correlation on a relatively large (170 meV) energy scale, which is attributed to the polaron formation.

Keywords

phase transitions oxide heterostructures electronic structure

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@article{arxiv.1002.0962,
  title  = {Structure and Correlation Effects in Semiconducting SrTiO$_{3}$},
  author = {Young Jun Chang and Aaron Bostwick and Yong Su Kim and Karsten Horn and Eli Rotenberg},
  journal= {arXiv preprint arXiv:1002.0962},
  year   = {2011}
}

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4 pages, 3 figures. submitted

Structure and Correlation Effects in Semiconducting SrTiO$_{3}$

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