# BaHgSn: A Dirac semimetal with surface hourglass fermions

@article{Zhang2020BaHgSnAD,
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},
year={2020}
}
• Published 2 December 2019
• Materials Science, Physics
• 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…
3 Citations

## Figures from this paper

### Photoexcited carrier dynamics of thin film Cd3As2 grown on a GaAs(111)B substrate by molecular beam epitaxy

• Materials Science, Physics
Physical Review B
• 2021
The topological Dirac semimetal ${\mathrm{Cd}}_{3}{\mathrm{As}}_{2}$ has drawn great attention for its novel physics and technical applications in optoelectronic devices operating in the infrared and

### Topological Descendants of Multicritical EuTl2

• Materials Science
• 2020
The past decades have witnessed a transformation in characterizing condensed matter systems with topology. Aided by a refined understanding of topological band structures with crystalline symmetries

### Glide-resolved photoemission spectroscopy: Measuring topological invariants in nonsymmorphic space groups

• Physics
• 2019
The two classes of 3D, time-reversal-invariant insulators are known to subdivide into four classes in the presence of glide symmetry. Here, we extend this classification of insulators to include

## References

SHOWING 1-10 OF 79 REFERENCES

### Colloquium : Topological insulators

• Physics
• 2010
Topological insulators are electronic materials that have a bulk band gap like an ordinary insulator but have protected conducting states on their edge or surface. These states are possible due to

### Erratum: Weyl semimetal phase in the non-centrosymmetric compound TaAs

• Physics
Nature Physics
• 2015
Experiments show that TaAs is a three-dimensional topological Weyl semimetal. Three-dimensional (3D) topologicalWeyl semimetals (TWSs) represent a state of quantum matter with unusual electronic

### Topological semimetals with triply degenerate nodal points in θ -phase tantalum nitride

• Physics
• 2016
Using first-principles calculation and symmetry analysis, we propose that $\ensuremath{\theta}$-TaN is a topological semimetal having a new type of point nodes, i.e., triply degenerate nodal points.

### New family of Dirac and Weyl semimetals in XAuTe (X = Na, K, Rb) ternary honeycomb compounds

• Chemistry
• 2016
We propose a new family of 3D Dirac semimetals based on XAuTe (X = K, Na, Rb) ternary honeycomb compounds, determined based on first-principles calculations, which are shown to be topological Dirac

### Surface states and topological invariants in three-dimensional topological insulators: Application to Bi 1 − x Sb x

• Physics
• 2008
We study the electronic surface states of the semiconducting alloy bismuth antimony Bi1�xSbx. Using a phenomenological tight-binding model, we show that the Fermi surface for the 111 surface states

### Topological semimetals predicted from first-principles calculations

• Physics
Journal of physics. Condensed matter : an Institute of Physics journal
• 2016
A summary on the theoretical predictions of three kinds of topological semimetals (TSMs), namely, Dirac semimetal (DSM), Weyl semicental (WSM) and node-line semimetAL (NLSM) and their relationships is given.

### Predicting Dirac semimetals based on sodium ternary compounds

• Materials Science
npj Computational Materials
• 2018
Predicting new Dirac semimetals, as well as other topological materials, is challenging since the relationship between crystal structure, atoms and band topology is complex and elusive. Here, we

### Experimental Discovery of the First Nonsymmorphic Topological Insulator KHgSb

Topological Insulator KHgSb J.-Z. Ma, C.-J. Yi, B. Q. Lv, Z. J. Wang, S.-M. Nie, L. Wang, L.-Y. Kong, Y.-B. Huang, P. Richard, H.-M. Weng, B. A. Bernevig, Y.-G. Shi, T. Qian, and H. Ding 1 Beijing

### Hourglass fermions

• Physics
Nature
• 2016
This work finds that non-symmorphic symmetries protect an exotic surface fermion whose dispersion relation is shaped like an hourglass; surface bands connect one hourglass to the next in an unbreakable zigzag pattern.

### From ultrasoft pseudopotentials to the projector augmented-wave method

• Materials Science
• 1999
The formal relationship between ultrasoft (US) Vanderbilt-type pseudopotentials and Bl\"ochl's projector augmented wave (PAW) method is derived. It is shown that the total energy functional for US