Topological insulators on the ruby lattice

ORAL

Abstract

We study a tight-binding model on the two-dimensional ruby lattice. This lattice supports two types of second neighbor spin-dependent hopping parameters in an s-band model that preserves time-reversal symmetry. We discuss the phase diagram of this model for various values of the hopping parameters, and note an interesting interplay between the two spin-orbit terms that individually would drive the system to a Z2 topological insulating phase. The fidelity of each phase is also calculated.

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Authors

  • Xiang Hu

    The University of Texas at Austin

  • Mehdi Kargarian

    The University of Texas at Austin

  • Gregory A. Fiete

    University of Texas at Austin, Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA, The University of Texas at Austin, Department of Physics,The University of Texas at Austin