Topological insulators from complex orbital order in transition-metal oxides heterostructures

Details Topological insulators from complex orbital order in transition-metal oxides heterostructures Topological insulators from complex orbital order in transition-metal oxides heterostructures

2011-09-06

arxiv.org/abs/1109.1297v2

Phys. Rev. B 84, 201103(R) (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4+6 pages, 3+1 figures, phase diagrams corrected and refined, reference list expanded

Scientific paper

10.1103/PhysRevB.84.201103

Topological band insulators which are dynamically generated by electron-electron interactions have been the- oretically proposed in two and three dimensional lattice models. We present evidence that the two-dimensional version can be stabilized in digital (111) heterostructures of transition-metal oxides as a result of purely local interactions. The topological phases are accompanied by spontaneous ordering of complex orbitals and we discuss their stability with respect to the Hund's rule coupling, Jahn-Teller interaction and inversion symmetry breaking terms. As main competitors we identify spin-nematic and magnetic phases.

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