Electronic structure and coexisting topological states in ferromagnetic and antiferromagnetic phases of MnBi2Te4 quantum wires

We theoretically investigate the electronic structure of cylindrical magnetic topological insulator quantum wires in MnBi2Te4. Our study reveals the emergence of topological surface states in the ferromagnetic phase, characterized by spin-polarized subbands resulting from intrinsic magnetization. In the antiferromagnetic phase, we identify the coexistence of three distinct types of topological states, encompassing both surface states and central states.