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29 March 2024 |
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Article overview
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Topological nodal lines and hybrid Weyl nodes in YCoC$_2$ | Yuanfeng Xu
; Yueqiang Gu
; Tiantian Zhang
; Chen Fang
; Zhong Fang
; Xianlei Sheng
; Hongming Weng
; | Date: |
6 May 2019 | Abstract: | Based on first-principles calculations and effective model analysis, we
propose that the noncentrosymmetric superconductor YCoC$_2$ in normal state is
a topological semimetal. In the absence of spin-orbit coupling (SOC), it can
host two intersecting nodal rings protected by two mirror planes, respectively.
One ring is composed of type-I nodes, where the two crossing bands have
opposite slop sign in their dispersions. The other ring consists of both type-I
and type-II nodes (the slop signs of the two bands are the same in certain
direction). In the presence of SOC, the former nodal ring is gapped totally
while the later one evolves into ten pairs of Weyl nodes, with two of them
being type-I and eight being type-II. The type-II Weyl nodes are further
classified into two kinds with different velocity matrix when described in Weyl
equation near the nodes. Fermi arcs from topological surface states are
observed in the surface projected energy dispersions. It is notably that
YCoC$_2$ has been reported as a superconductor with critical temperature $T_c$
of 4.2 K. This makes it very attractive since including superconducting into
topological semimetal state might result in topological superconductivity and
be used to synthesize Majorana zero modes. | Source: | arXiv, 1905.1757 | Services: | Forum | Review | PDF | Favorites |
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