Topological and superconducting properties of two-dimensional MXC3 [M:X = In:As, Se:As, In:Te and As:Te] by first-principles study

Abstract

Topological superconductivity is a fascinating quantum property in the field of condensed matter physics. The exploration of topological superconductivity in two-dimensional (2D) materials has become one of the current hot topics. Based on first-principles calculations, we predict that 2D MXC₃ materials (M:X = In:As, Se:As, In:Te and As:Te) are thermodynamically and dynamically stable. InAsC₃, SeAsC₃ and InTeC₃ possess topologically non-trivial metallic properties. More interestingly, all of these materials are revealed to be phonon-mediated superconductors, with InAsC₃ and SeAsC₃ exhibiting a higher critical temperature (T_c) of 33.6 and 17 K, respectively. The T_c of InAsC₃ and SeAsC₃ is higher than those of most structures with both topological and superconductivity properties. The discovery of 2D MXC₃ provides a new platform for exploring 2D topological superconductors.