Routes to realize the axion-insulator phase in MnBiTe(BiTe) family: a perspective
arXiv:2105.14575 · doi:10.1063/5.0059447
Abstract
Axion, first postulated as a hypothetical particle in high-energy physics, is now extended to describe a novel topological magnetoelectric effect derived from the Chern-Simons theory in condensed matter systems. The recent discovered intrinsic magnetic topological insulators MnBi2Te4 and its derivatives have attracted great attention because of their potential as a material platform to realize such a quantized axion field. Since the magnetic exchange gap can bring the half-quantized anomalous Hall effect at the surface, an axion insulator manifests as quantum anomalous Hall and zero Hall plateau effects in the thin films. However, many puzzles about this material family remain elusive yet, such as the gapless surface state and the direct experimental evidence of the axion insulator. In this Perspective, we discuss the preconditions, manifestations and signatures of the axion-insulator phase, in the context of the development of the natural magnetic topological heterostructure MnBi2Te4(Bi2Te3)n family with various intriguing quantum phenomena. Recent theoretical and experimental efforts regarding the intrinsic magnetic topological insulators are summarized here to pave the way for this phenomenally developing field.
References in corpus (19)
- Topological Field Theory of Time-Reversal Invariant Insulators
- High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator
- Antiferromagnetic topological insulators
- Electrically detected interferometry of Majorana fermions in a topological insulator
- Crystal growth and magnetic structure of MnBi2Te4
- Controlling bulk conductivity in topological insulators: Key role of anti-site defects
- Imaging Dirac-Mass Disorder from Magnetic Dopant-Atoms in the Ferromagnetic Topological Insulator Cr(BiSb)Te
- Chiral anomaly, Charge Density Waves, and Axion Strings from Weyl Semimetals
- Unexpected mass acquisition of Dirac fermions at the quantum phase transition of a topological insulator
- Axion Electrodynamics in Topological Materials
- Tailoring tricolor structure of magnetic topological insulator for robust axion insulator
- Intertwined Topological and Magnetic Orders in Atomically Thin Chern Insulator MnBi2Te4
- Robust A-type order and spin-flop transition on the surface of the antiferromagnetic topological insulator MnBiTe
- Coexistence of Surface Ferromagnetism and Gapless Topological State in MnBiTe
- Any Axion Insulator Must be a Bulk Three-Dimensional Topological Insulator
- Critical Behavior and Universal Signature of an Axion Insulator State
- Direct evidence of ferromagnetism in MnSb2Te4
- Observation of superparamagnetism in coexistence with quantum anomalous Hall C=1 and C=0 Chern states
- Recent advancements in the study of intrinsic magnetic topological insulators and magnetic Weyl semimetals