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CaFeAs2: A staggered intercalation of quantum spin Hall and high-temperature superconductivity.

Authors :
Xianxin Wu
Shengshan Qin
Yi Liang
Congcong Le
Heng Fan
Jiangping Hu
Source :
Physical Review B: Condensed Matter & Materials Physics. Feb2015, Vol. 91 Issue 8, p081111-1-081111-5. 5p.
Publication Year :
2015

Abstract

We predict that CaFeAs2, a newly discovered iron-based high-temperature (Tc) superconductor, is a staggered intercalation compound that integrates topological quantum spin Hall (QSH) and superconductivity (SC). CaFeAs2 has a structure with staggered CaAs and FeAs layers. While the FeAs layers are known to be responsible for high Tc superconductivity, we show that with spin orbital coupling each CaAs layer is a Z2 topologically nontrivial two-dimensional QSH insulator and the bulk is a three-dimensional weak topological insulator. In the superconducting state, the edge states in the CaAs layer are natural one-dimensional topological superconductors. The staggered intercalation of QSH and SC provides us a unique opportunity to realize and explore physics, such as Majorana modes and Majorana fermion chains. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
10980121
Volume :
91
Issue :
8
Database :
Academic Search Index
Journal :
Physical Review B: Condensed Matter & Materials Physics
Publication Type :
Academic Journal
Accession number :
102211421
Full Text :
https://doi.org/10.1103/PhysRevB.91.081111