Abstract
The studies of topological insulators (TI) and topological semimetals have been at frontiers of condensed matter physics and material science. Both classes of materials are characterized by robust surface states created by the topology of the bulk band structures and exhibit exotic transport properties. When magnetism is present in topological materials and breaks the time-reversal symmetry, more exotic quantum phenomena can be generated, e.g., quantum anomalous Hall effect (QAHE), axion insulator, and large intrinsic AHE. In this research update, we briefly summarize the recent research progress in magnetic topological materials, including intrinsic magnetic TI and magnetic Weyl semimetals.
Highlights
Magnetic topological materials, including magnetic topological insulators (TI) and magnetic topological semimetals, have attracted broad interests
Magnetic TIs can be achieved in three different ways: magnetic doping in a TI,1,2 proximity of a TI to a ferromagnetic (FM) or an antiferromagnetic (AFM) insulator,3–5 or creating intrinsic FM or AFM order in a TI.6
The spontaneous magnetization induced in magnetic TIs interacts with topological surface states and opens a gap at the surface Dirac point, which can generate a new topological quantum state—quantum anomalous Hall insulator (QAHI), when the chemical potential is tuned to an appropriate value in thin film samples
Summary
Magnetic topological materials, including magnetic topological insulators (TI) and magnetic topological semimetals, have attracted broad interests. The spontaneous magnetization induced in magnetic TIs interacts with topological surface states and opens a gap at the surface Dirac point, which can generate a new topological quantum state—quantum anomalous Hall insulator (QAHI), when the chemical potential is tuned to an appropriate value in thin film samples. The interplay between magnetism and non-trivial band topology can generate new exotic quantum states. One remarkable example is time reversal symmetry (TRS) breaking Weyl semimetal (WSM) state in which linearly dispersed, spin-split bands cross at discrete momentum points, resulting in Weyl nodes. When the Weyl nodes are at or close to the Fermi level, net Berry curvature can be present due to broken TRS, which can give rise to new exotic quantum phenomena such as large intrinsic anomalous Hall effect (AHE) and anomalous Nernst effect (ANE).. We will give a brief overview on the studies of these materials
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