BaHgSn: A Dirac semimetal with surface hourglass fermions

  title={BaHgSn: A Dirac semimetal with surface hourglass fermions},
  author={Tan Zhang and Zhihai Cui and Zhijun Wang and Hongming Weng and Zhong Fang},
  journal={Physical Review B},
We proposed that BaHgSn is a Dirac semimetal (DSM) which can host hourglasslike surface states (HSSs) as protected by nonsymmorphic glide symmetry. Compared to KHgSb, an isostructural topological crystalline insulator with the same HSSs, BaHgSn has an additional band inversion at the $\mathrm{\ensuremath{\Gamma}}$ point. This band inversion is induced by the stronger interlayer coupling among Hg-Sn honeycomb layers than that among Hg-Sb layers in KHgSb, which leads to bulk Dirac nodes in BaHgSn… 
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