Topological hybrid semimetal phases and anomalous Hall effects in a three dimensional magnetic topological insulator

TL;DR

This paper proposes ferromagnetic Bi$_2$Se$_3$ as a candidate for hosting coexisting Weyl and nodal-line semimetal phases, demonstrating tunable topological phases and their responses, advancing understanding of topological transport in 3D materials.

Contribution

It introduces a method to realize and tune Weyl and nodal-line semimetal phases in a magnetic topological insulator, highlighting their topological responses.

Findings

Multiple topological phases can be induced by tuning the Zeeman field.

The coexistence of Weyl and nodal-line phases is demonstrated.

Topological responses under gauge fields are analyzed.

Abstract

In this work, we propose a ferromagnetic Bi$_2$Se$_3$ as a candidate to hold the coexistence of Weyl- and nodal-line semimetal phases, which breaks the time reversal symmetry. We demonstrate that the type-I Weyl semimetal phase, type-I-, type-II- and their hybrid nodal-line semimetal phases can arise by tuning the Zeeman exchange field strength and the Fermi velocity. Their topological responses under U(1) gauge field are also discussed. Our results raise a new way for realizing Weyl and nodal-line semimetals and will be helpful in understanding the topological transport phenomena in three-dimensional material systems.