Multiple Triple-Point Fermions in Heusler Compounds
Abstract
Using the density functional theoretical calculations, we report a new set of topological semimetals XYZ (X = \{Cu, Rh, Pd, Ag, Au, Hg\}, Y = \{Li, Na, Sc, Zn, Y, Zr, Hf, La, Pr, Pm, Sm, Tb, Dy, Ho, Tm\} and Z =\{Mg, Al, Zn, Ga, Y, Ag, Cd, In, Sn, Ta, Sm\}), which show the existence of multiple topological triple point fermions along four independent axes. These fermionic quasiparticles have no analogues elementary particle in the standard model. The angle-resolved photoemission spectroscopy is simulated to obtain the exotic topological surface states and the characteristic Fermi arcs. The inclusion of spin-orbit coupling splits the triple-point into two Dirac points. The triple-point fermions are exhibited on the easily cleavable (111) surface and are well separated from the surface point, allowing them to be resolved in the surface spectroscopic techniques. This intermediate linearly dispersive degeneracy between Weyl and Dirac points may offer prospective candidates for quantum transport applications.
Cite
@article{arxiv.1801.05699,
title = {Multiple Triple-Point Fermions in Heusler Compounds},
author = {Ranjan Kumar Barik and Ravindra Shinde and Abhishek K. Singh},
journal= {arXiv preprint arXiv:1801.05699},
year = {2018}
}