A strongly robust type II Weyl fermion semimetal state in Ta₃S₂.

ABSTRACT: Weyl semimetals are of great interest because they provide the first realization of the Weyl fermion, exhibit exotic quantum anomalies, and host Fermi arc surface states. The separation between Weyl nodes of opposite chirality gives a measure of the robustness of the Weyl semimetal state. To exploit the novel phenomena that arise from Weyl fermions in applications, it is crucially important to find robust separated Weyl nodes. We propose a methodology to design robust Weyl semimetals with well-separated Weyl nodes. Using this methodology as a guideline, we search among the material parameter space and identify by far the most robust and ideal Weyl semimetal candidate in the single-crystalline compound tantalum sulfide (Ta₃S₂) with new and novel properties beyond TaAs.

SUBMITTER: Chang G 

PROVIDER: S-EPMC5566128 | biostudies-literature | 2016 Jun

REPOSITORIES: biostudies-literature