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Hourglass semimetals with nonsymmorphic symmetries | | Luyang Wang
; Shao-Kai Jian
; Hong Yao
; | | Date: |
20 Feb 2017 | | Abstract: | It was recently shown that nonsymmorphic space group symmetries can protect
novel extit{surface} states with hourglass-like dispersions. In this paper,
we show that such hourglass-like dispersions can also appear in the
extit{bulk} dispersions of systems which respect nonsymmorphic symmetries.
Specifically, we construct 2D and 3D lattice models featuring hourglass-like
dispersions in the bulk, which are protected by nonsymmorphic and time-reversal
symmetries. We call such systems as hourglass semimetals, since they all have
point or line nodes associated with the hourglass-like dispersions. In 3D,
hourglass nodal lines may appear in glide-invariant planes, while hourglass
Weyl points can occur on screw-invariant axes. The Weyl points and surface
Fermi arcs in hourglass Weyl semimetals are stable against weak perturbations
breaking those nonsymmorphic symmetries. Our results shall shed light to
searching for new type of nodal-line and Weyl semimetals in nonsymmorphic
materials. | | Source: | arXiv, 1702.6140 | | Services: | Forum | Review | PDF | Favorites | |
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