Intrinsic topological metal state in T-graphene

Abstract An intrinsic topological metal (TM) state is found in the T-graphene, a monolayer with both time-reversal symmetry and four-fold symmetry. The distinguishes itself by nontrivial electric polarization from ordinary metals features two local edge states corresponding nanoribbons. TM confirmed as transition bridging insulator when relative neighboring hoppings change lattice. nature further verified checking robustness of transport property against randomly-introduced strong disorders. fact that multiple indexed different parameters coexist such practical system shows broad prospect versatile devices.