Skip to main content

Time-Reversal-Breaking Weyl Fermions in Magnetic Heusler Alloys

Author(s): Wang, Zhijun; Vergniory, MG; Kushwaha, S; Hirschberger, Max; Chulkov, EV; et al

To refer to this page use:
Abstract: 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.
Publication Date: 2-Dec-2016
Electronic Publication Date: 30-Nov-2016
Citation: Wang, Zhijun, Vergniory, MG, Kushwaha, S, Hirschberger, Max, Chulkov, EV, Ernst, A, Ong, NP, Cava, Robert J, Bernevig, B Andrei. (2016). Time-Reversal-Breaking Weyl Fermions in Magnetic Heusler Alloys. PHYSICAL REVIEW LETTERS, 117 (10.1103/PhysRevLett.117.236401
DOI: doi:10.1103/PhysRevLett.117.236401
ISSN: 0031-9007
EISSN: 1079-7114
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW LETTERS
Version: Final published version. This is an open access article.

Items in OAR@Princeton are protected by copyright, with all rights reserved, unless otherwise indicated.