Abstract
Based on the first-principles calculation, we have studied the electronic band structures and topological properties of CoSb2-type binary monoclinic compound RhSb2 and superconductor RhBi2. By substituting congeners Bi for chemical element Sb, the compounds exhibit the transition from trivial semiconductor to nontrivial metal in the normal state. The three-dimensional strong topological insulator phase exists in the superconductor RhBi2 and the corresponding topological surface states on the (100) surface near Fermi level. By adding different compressed strains, topological phase transition and superconductivity can also be achieved in the compound RhSb2. The natural combination of nontrivial topology and superconductivity in monoclinic superconductors RhX2 (X=Sb,Bi) provides us a new promising platform to study topological superconductivity.
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