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| Earth, home of human beings, is 70% water and 30% land which has nurtured splendid civilizations and flourishing lives. The cover story of this issue reflects the evolution of Earth by merging an unknown planet in a unified scene with different landscapes throughout the history such as glacier, desert, ocean, mountain, river and magma. The contrast between the past to reality can best illustrate our respect to our motherland. It is not only the subjects of geoscience studies, but also the common goal of all multidisciplinary research and the shared duties of mankind to understand, care and protect our planet to build a better future. |
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| Position: Home > issue > May 28, 2021 Volume 2, Issue 2 |
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| Intrinsic magnetic topological insulators |
| Category: Review |
| Author: Pinyuan Wang, Jun Ge, Jiaheng Li, Yanzhao Liu, Yong Xu, Jian Wang |
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Graphical abstract
Introducing magnetism into topological insulators breaks time-reversal symmetry, and the magnetic exchange interaction can open a gap in the otherwise gapless topological surface states. This allows various novel topological quantum states to be generated, including the quantum anomalous Hall effect (QAHE) and axion insulator states. Magnetic doping and magnetic proximity are viewed as being useful means of exploring the interaction between topology and magnetism. However, the inhomogeneity of magnetic doping leads to complicated magnetic ordering and small exchange gaps, and consequently the observed QAHE appears only at ultralow temperatures.
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SHANGHAI INSTITUTE OF APPLIED PHYSICS, CAS
INSTITUTE OF MICROBIOLOGY, CAS
XI'AN INSTITUTE OF OPTICS AND PRECISION MECHANICS, CAS
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