Experimental evidence of hourglass fermion in the candidate nonsymmorphic topological insulator KHgSb

Science Advances
Junzhang MaH Ding

Abstract

Topological insulators (TIs) host novel states of quantum matter characterized by nontrivial conducting boundary states connecting valence and conduction bulk bands. All TIs discovered experimentally so far rely on either time-reversal or mirror crystal symmorphic symmetry to protect massless Dirac-like boundary states. Several materials were recently proposed to be TIs with nonsymmorphic symmetry, where a glide mirror protects exotic surface fermions with hourglass-shaped dispersion. However, an experimental confirmation of this new fermion is missing. Using angle-resolved photoemission spectroscopy, we provide experimental evidence of hourglass fermions on the (010) surface of crystalline KHgSb, whereas the (001) surface has no boundary state, in agreement with first-principles calculations. Our study will stimulate further research activities of topological properties of nonsymmorphic materials.

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Citations

Dec 1, 2017·Nature Communications·Shan-Shan WangShengyuan A Yang
Jul 31, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Vladimir DamljanovicMilan Damnjanovic
Jul 22, 2018·Science·Benjamin J WiederB Andrei Bernevig
Jun 14, 2019·Scientific Reports·Kamal ChoudharyFrancesca Tavazza
Jul 10, 2019·Physical Review Letters·Akito DaidoYouichi Yanase
Oct 22, 2019·Physical Review Letters·Z F WangWei Zhu
Nov 10, 2018·Physical Review Letters·Raquel Queiroz, Ady Stern
Apr 1, 2020·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Marek KopciuszyńskiRyszard Zdyb
Dec 15, 2018·Physical Review Letters·Bahadur SinghArun Bansil
Nov 4, 2020·Nature Materials·Prineha NarangClaudia Felser
Jul 10, 2021·The Journal of Physical Chemistry Letters·Puru Jena, Qiang Sun
Aug 9, 2021·Advanced Materials·Wenjun KuangIrina V Grigorieva
Oct 29, 2020·Journal of the American Chemical Society·Dong-Choon RyuByung Il Min

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Methods Mentioned

BETA
x-ray diffraction
electron diffraction

Software Mentioned

Vienna Ab initio Simulation Package

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