Publication

Article Metrics

Citations


Online attention

Observation of the anisotropic Dirac cone in the band dispersion of 112-structured iron-based superconductor Ca0.9La0.1FeAs2

DOI: 10.1063/1.4960164 DOI Help

Authors: Z. T. Liu (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences) , X. Z. Xing (Department of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University) , M. Y. Li (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences) , W. Zhou (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences) , Y. Sun (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences) , C. C. Fan (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences) , H. F. Yang (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences) , J. S. Liu (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences) , Q. Yao (Fudan University; Chinese Academy of Sciences) , W. Li (Fudan University; Chinese Academy of Sciences; CAS-Shanghai Science Research Center) , Z. X. Shi (Department of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University) , D. W. Shen (Chinese Academy of Sciences; CAS-Shanghai Science Research Center; CAS Center for Excellence in Superconducting Electronics (CENSE)) , Z. Wang (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Applied Physics Letters , VOL 109

State: Published (Approved)
Published: July 2016
Diamond Proposal Number(s): 12848

Abstract: CaFeAs2 is a parent compound of recently discovered 112-type iron-based superconductors. It is predicted to be a staggered intercalation compound that naturally integrates both quantum spin Hall insulating and superconducting layers and an ideal system for the realization of Majorana modes. We performed a systematical angle-resolved photoemission spectroscopy and first-principles calculation study of the slightly electron-doped CaFeAs2. We found that the zigzag As chain of 112-type iron-based superconductors play a considerable role in the low-energy electronic structure, resulting in the characteristic Dirac-cone like band dispersion as the prediction. Our experimental results further confirm that these Dirac cones only exist around the X but not Y points in the Brillouin zone, breaking the S 4 symmetry at iron sites. Our findings present the compelling support to the theoretical prediction that the 112-type iron-based superconductors might host the topological nontrivial edge states. The slightly electron doped CaFeAs2 would provide us a unique opportunity to realize and explore Majorana fermion physics.

Subject Areas: Physics, Materials


Instruments: I05-ARPES