Topological and Superconductivity Coexist Phase in MoC
Angus Huang1*, Guang Bian2, Horng-Tay Jeng1,3
1Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
2Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA
3Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
* Presenter:Angus Huang,
In this work, the electronic and phonon properties of the superconductor molybdenum carbide (MoC) are studied by first-principles methods. Two different structure of MoC, namely the alpha and gamma phases have been synthesized. Our calculations show that topological nodal lines and superconductivity coexist in both phases. The superconductivity transition temperature Tc increases with hole doping. The topological invariant of both phases are found to be nontrivial by the method of Wilson loop. This work provides a promising material candidate for the search of topological superconductivity and the elusive Majorana fermions.

Keywords: first principle, topological material, superconductor, topological superconductor, Majorana fermion