Topological insulators in three dimensions from spontaneous symmetry breaking

Details Topological insulators in three dimensions from spontaneous symmetry breaking Topological insulators in three dimensions from spontaneous symmetry breaking

2009-04-04

arxiv.org/abs/0904.0690v2

Phys. Rev. B 79, 245331 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 6 figures

Scientific paper

10.1103/PhysRevB.79.245331

We study three dimensional systems where strong repulsion leads to an insulating state via spontaneously generated spin-orbit interactions. We discuss a microscopic model where the resulting state is topological. Such topological `Mott' insulators differ from their band insulator counterparts in that they possess an additional order parameter, a rotation matrix, that describes the spontaneous breaking of spin-rotation symmetry. We show that line defects of this order are associated with protected one dimensional modes in the {\em strong} topological Mott insulator, which provides a bulk characterization of this phase.

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