We predict a new class of topological crystalline insulators (TCI) in the anti-perovskite material family with the chemical formula A3BX. Here the nontrivial topology arises from band inversion between two J=3/2 quartets, which is described by a generalized Dirac equation for a "Dirac octet". Our work suggests that anti-perovskites are a promising new venue for exploring the cooperative interplay between band topology, crystal symmetry and electron correlation.
@article{arxiv.1407.4809,
title = {Topological Crystalline Insulators and Dirac Octets in Anti-perovskites},
author = {Timothy H. Hsieh and Junwei Liu and Liang Fu},
journal= {arXiv preprint arXiv:1407.4809},
year = {2014}
}
Comments
Accepted as PRB Rapid Communication. 4 pages, 3 figures, 3 pages of Supplementary Material. Typos fixed