Signatures of Fermi Arcs in the Quasiparticle Interferences of the Weyl Semimetals TaAs and NbP

Guoqing Chang, Su-Yang Xu, Hao Zheng, Chi-Cheng Lee, Shin-Ming Huang, Ilya Belopolski, Daniel S. Sanchez, Guang Bian, Nasser Alidoust, Tay-Rong Chang, Chuang-Han Hsu, Horng-Tay Jeng (+3 others)
2016 Physical Review Letters  
The recent discovery of the first Weyl semimetal in TaAs provides the first observation of a Weyl fermion in nature. Such a topological semimetal features a novel type of anomalous surface state, the Fermi arc, which connects a pair of Weyl nodes through the boundary of the crystal. Here, we present theoretical calculations of the quasi-particle interference (QPI) patterns that arise from the surface states including the topological Fermi arcs in the Weyl semimetals TaAs and NbP. Most
more » ... y, we discover that the QPI exhibits termination-points that are fingerprints of the Weyl nodes in the interference pattern. Our results, for the first time, propose an interference signature of the topological Fermi arcs in TaAs, which provides important guidelines for STM measurements on this prototypical Weyl semimetal compound. The scattering channels presented here is relevant to transport phenomena on the surface of the TaAs class of Weyl semimetals. Our work is also the first systematic calculation of the quantum interferences from the Fermi arc surface states, which is in general useful for future STM studies on other Weyl semimetals.
doi:10.1103/physrevlett.116.066601 pmid:26919003 fatcat:pjn4is2iwzhk5bhtfwguy3kmsy