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Li, FY; Li, YD; Kim, YB; Balents, L4; Yu, Y5,6,7,8; Chen, G5,6,7,8
Weyl magnons in breathing pyrochlore antiferromagnets
AbstractFrustrated quantum magnets not only provide exotic ground states and unusual magnetic structures, but also support unconventional excitations in many cases. Using a physically relevant spin model for a breathing pyrochlore lattice, we discuss the presence of topological linear band crossings of magnons in antiferromagnets. These are the analogues of Weyl fermions in electronic systems, which we dub Weyl magnons. The bulk Weyl magnon implies the presence of chiral magnon surface states forming arcs at finite energy. We argue that such antiferromagnets present a unique example, in which Weyl points can be manipulated in situ in the laboratory by applied fields. We discuss their appearance specifically in the breathing pyrochlore lattice, and give some general discussion of conditions to find Weyl magnons, and how they may be probed experimentally. Our work may inspire a re-examination of the magnetic excitations in many magnetically ordered systems.
Subject AreaScience & Technology - Other Topics
Indexed BySCI
Funding OrganizationStart-Up Fund of Fudan University ; Thousand-Youth-Talent Program of People's Republic of China ; NSERC ; DOE Office of Basic Energy Sciences [DE-FG02-08ER46524] ; 973 Program of MOST of China [2012CB821402] ; NNSF of China [11174298, 11474061]
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China
2.Fudan Univ, Sch Comp Sci, Shanghai 200433, Peoples R China
3.Univ Toronto, Dept Phys, Canadian Inst Adv Res, Quantum Mat Program, Toronto, ON MSG 1Z8, Canada
4.Korea Inst Adv Study, Sch Phys, Seoul 130722, South Korea
5.Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA
6.Fudan Univ, State Key Lab Surface Phys, Shanghai 200433, Peoples R China
7.Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China
8.Fudan Univ, Dept Phys, Ctr Field Theory & Particle Phys, Shanghai 200433, Peoples R China
9.Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Li, FY,Li, YD,Kim, YB,et al. Weyl magnons in breathing pyrochlore antiferromagnets[J]. NATURE COMMUNICATIONS,2016,7:12691.
APA Li, FY,Li, YD,Kim, YB,Balents, L,Yu, Y,&Chen, G.(2016).Weyl magnons in breathing pyrochlore antiferromagnets.NATURE COMMUNICATIONS,7,12691.
MLA Li, FY,et al."Weyl magnons in breathing pyrochlore antiferromagnets".NATURE COMMUNICATIONS 7(2016):12691.
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