Chern semimetal and the quantized anomalous Hall effect in HgCr2Se4.
By Gang Xu, H. Weng, Zhijun Wang, X. Dai, Z. Fang. Physical Review Letters, 2011
1,035 citations recorded by the source corpus.
In 3D momentum space, a topological phase boundary separating the Chern insulating layers from normal insulating layers may exist, where the gap must be closed, resulting in a "Chern semimetal" state with topologically unavoidable band crossings at the Fermi level. This state is a condensed-matter realization of Weyl fermions in (3+1)D, and should exhibit remarkable features, such as magnetic monopoles and Fermi arcs. Here we predict, based on first principles calculations, that such a novel quantum state can be realized in a known ferromagnetic compound HgCr2Se4, with a single pair of Weyl fermions separated in momentum space. The quantum Hall effect without an external magnetic field can be achieved in its quantum-well structure.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/5d48b7a1449f0022f229022f27ca2efeb4f659be
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Citations in the corpus
- Weyl Semimetal Phase in Noncentrosymmetric Transition-Metal Monophosphides (2014, methodology): “A relatively simpler system HgCr2Se4 [9] was then proposed by some of the present authors, where a pair of double-Weyl points due to quadratic band crossing appear when the system is in a ferromagnetic phase.”
- Observation of Weyl nodes in TaAs (2015, background): “[7] Gang Xu, Hongming Weng, Zhijun Wang, Xi Dai, and Zhong Fang.”
- High-temperature quantum anomalous Hall regime in a MnBi2Te4/Bi2Te3 superlattice (2020, background): “[13] Xu, G.”