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Comment on "Topological insulators in ternary compounds with honeycomb lattice"

Authors: M.G. Vergniory, M.A.L. Marques, S. Botti, M. Amsler, S. Goedecker, E.V. Chulkov, A. Ernst, and A.H. Romero

Ref.: Phys. Rev. Lett. 110, 129701 (2013)

Abstract: The Letter by Zhang et al. predicted, on purely theoretical bases, the existence of a family of topological insulators. This family can be seen as a relative of graphite and crystallizes in a honeycomb lattice (space group P6_3/mmc, #194). Keeping this structure, the authors tried many ternary combinations by replacing the three chemical elements. However, the honeycomb structure of Zhang et al. is dynamically unstable for some of the proposed materials, including the key example LiAuSe, whose true ground state does not display topological insulator properties.

URL: link.aps.org

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