期刊
PHYSICAL REVIEW LETTERS
卷 117, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.236401
关键词
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资金
- Department of Energy [DE-SC0016239]
- National Science Foundation EAGER [NOA-AWD1004957]
- Simons Investigator Grants [ONR-N00014-14-1-0330, ARO MURI W911NF-12-1-0461, NSF-MRSEC DMR-1420541]
- Packard Foundation
- Schmidt Fund for Innovative Research
- National Natural Science Foundation of China [11504117]
- Basque Country Government
- Departamento de Educacion, Universidades e Investigacion [IT-756-13]
- Spanish Ministerio de Economia e Innovacion [FIS2010-19609-C02-01, FIS2013-48286-C2-1-P]
- FEDER
- St. Petersburg State University [15.61.202.2015]
- Joint Initiative for Research and Innovation within the Fraunhofer and Max Planck cooperation program
- DFG Priority Program Topological Insulators [1666]
- MURI [ARO W911NF-12-1-0461]
Weyl fermions have recently been observed in several time-reversal-invariant semimetals and photonics materials with broken inversion symmetry. These systems are expected to have exotic transport properties such as the chiral anomaly. However, most discovered Weyl materials possess a substantial number of Weyl nodes close to the Fermi level that give rise to complicated transport properties. Here we predict, for the first time, a new family of Weyl systems defined by broken time-reversal symmetry, namely, Co-based magnetic Heusler materials XCo(2)Z (X = IVB or VB; Z = IVA or IIIA). To search for Weyl fermions in the centrosymmetric magnetic systems, we recall an easy and practical inversion invariant, which has been calculated to be -1, guaranteeing the existence of an odd number of pairs of Weyl fermions. These materials exhibit, when alloyed, only two Weyl nodes at the Fermi level-the minimum number possible in a condensed matter system. The Weyl nodes are protected by the rotational symmetry along the magnetic axis and separated by a large distance (of order 2 pi) in the Brillouin zone. The corresponding Fermi arcs have been calculated as well. This discovery provides a realistic and promising platform for manipulating and studying the magnetic Weyl physics in experiments.
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