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Title: Prediction of an arc-tunable Weyl Fermion metallic state in Mo xW 1-xTe 2

A Weyl semimetal is a new state of matter that hosts Weyl fermions as emergent quasiparticles. The Weyl fermions correspond to isolated points of bulk band degeneracy, Weyl nodes, which are connected only through the crystal’s boundary by exotic Fermi arcs. The length of the Fermi arc gives a measure of the topological strength, because the only way to destroy the Weyl nodes is to annihilate them in pairs in the reciprocal space. To date, Weyl semimetals are only realized in the TaAs class. Here, we propose a tunable Weyl state in Mo xW 1₋xTe 2 where Weyl nodes are formed by touching points between metallic pockets. We show that the Fermi arc length can be changed as a function of Mo concentration, thus tuning the topological strength. Lastly,our results provide an experimentally feasible route to realizing Weyl physics in the layered compound Mo xW 1₋xTe 2, where non-saturating magneto-resistance and pressure-driven superconductivity have been observed.
Authors:
 [1] ;  [2] ; ORCiD logo [3] ;  [3] ; ORCiD logo [3] ; ORCiD logo [4] ;  [2] ; ORCiD logo [2] ;  [2] ;  [2] ;  [2] ;  [5] ;  [6] ;  [7] ;  [3] ; ORCiD logo [8]
  1. National Tsing Hua Univ., Hsinchu (Taiwan)
  2. Princeton Univ., NJ (United States). Dept.of Physics
  3. National Univ. of Singapore (Singapore)
  4. National Univ. of Singapore (Singapore); Northeastern Univ., Boston, MA (United States)
  5. Princeton Univ., NJ (United States). Dept.of Physics; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Northeastern Univ., Boston, MA (United States)
  7. National Tsing Hua Univ., Hsinchu (Taiwan); Academia Sinica, Taipei (Taiwan)
  8. Princeton Univ., NJ (United States). Dept.of Physics; Princeton Univ., NJ (United States). Princeton Institute for the Science and Technology of Materials
Publication Date:
OSTI Identifier:
1259283
Report Number(s):
LA-UR-17-22173
Journal ID: ISSN 2041-1723; ncomms10639
Grant/Contract Number:
FG-02- 05ER46200; NRF-NRFF2013-03; FG02-07ER46352; AC02-05CH11231; GBMF4547; AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Singapore National Science Foundation; USDOE Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Material Science