Low Energy Conduction Band Structure of SrTiO3

ORAL

Abstract

The recent observation of a high mobility 2DEG, and truly two-dimensional superconductor, at oxide interfaces with SrTiO3 (STO) and in delta-doped layers of STO have thus far gone without a clear theoretical description. The starting point for any quantitative theory of these systems is a reliable low energy parameterization of the Ti d-band in the bulk parent compound. Here we present a five parameter symmetry constrained model of the t2g band in STO near the conduction band minimum. We use this model to describe a recent high field (up to 31 Tesla), low temperature, angular magneto-transport study of lightly La doped STO and compare our results with other available experimental data. We will also discuss the relation between orbital density and matrix element effects in photoemission experiments of d0 Perovskites.

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Authors

  • Guru Khalsa

    Department of Physics - University of Texas at Austin

  • Bharat Jalan

    Materials Department, UCSB

  • S. James Allen

    Department of Physics, UCSB, Department of Physics, University of CA, Santa Barbara, Department of Physics - UCSB, Physics Department, UCSB, University of California, Santa Barbara

  • Susanne Stemmer

    Materials Department, UCSB, Materials Department, University of CA, Santa Barbara, Materials Dept., UCSB, University of California, Santa Barbara, UC Santa Barbara

  • Allan MacDonald

    University of Texas at Austin, Department of Physics, University of Texas at Austin, Department of Physics - University of Texas at Austin