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Title: Topological phases in oxide heterostructures with light and heavy transition metal ions (invited)

Using a combination of density functional theory, tight-binding models, and Hartree-Fock theory, we predict topological phases with and without time-reversal symmetry breaking in oxide heterostructures. We consider both heterostructures containing light transition metal ions and those containing heavy transition metal ions. We find that the (111) growth direction naturally leads to favorable conditions for topological phases in both perovskite structures and pyrochlore structures. For the case of light transition metal elements, Hartree-Fock theory predicts the spin-orbit coupling is effectively enhanced by on-site multiple-orbital interactions and may drive the system through a topological phase transition, while heavy elements with intrinsically large spin-orbit coupling require much weaker or even vanishing electron interactions to bring about a topological phase.
Authors:
 [1] ;  [2]
  1. Department of Physics, The University of Texas at Austin, Austin, Texas 78712 (United States)
  2. Theoretische Physik, ETH Zürich, CH-8093 Zürich (Switzerland)
Publication Date:
OSTI Identifier:
22402963
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CRYSTAL GROWTH; CRYSTAL STRUCTURE; DENSITY FUNCTIONAL METHOD; ELECTRONS; HARTREE-FOCK METHOD; HETEROJUNCTIONS; IONS; L-S COUPLING; OXIDES; PEROVSKITE; PHASE TRANSFORMATIONS; PYROCHLORE; SYMMETRY BREAKING; TOPOLOGY; TRANSITION ELEMENTS; VISIBLE RADIATION