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.

*We gratefully acknowledge funding from ARO grant W911NF-09-1-0527

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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