Abstract
The interplay between band topology and magnetic order could generate a variety of time-reversal-breaking gapped topological phases with exotic topological quantization phenomena, such as quantum anomalous Hall (QAH) insulators and axion insulators (AxI). Here by combining analytic models and first-principles calculations, we find extremely rich magnetic topological quantum states in a van der Waals layered material , including a dynamic axion field in the antiferromagnetic bulk, an ideal magnetic Weyl semimetal with a single pair of Weyl points, as well as QAH and AxI phases in thin films. The phase transition between QAH and AxI is tuned by the layer magnetization, which would provide a promising platform for chiral superconducting phases and Majorana fermion. We further present a simple and unified continuum model that captures the magnetic topological features, and is generic for and family materials.
- Received 4 April 2020
- Accepted 10 September 2020
DOI:https://doi.org/10.1103/PhysRevB.102.121107
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