Weyl magnons in breathing pyrochlore antiferromagnets

Li, Fei-Ye; Li, Yao-Dong; Kim, Yong Baek; Balents, Leon; Yu, Yue; Chen, Gang

doi:10.1038/ncomms12691

Title: Weyl magnons in breathing pyrochlore antiferromagnets

Journal Article · Wed Sep 21 04:00:00 UTC 2016 · Nature Communications

DOI: https://doi.org/10.1038/ncomms12691 · OSTI ID:1361676

Li, Fei-Ye ^[1];

^[2]; Kim, Yong Baek ^[3]; Balents, Leon ^[4]; Yu, Yue ^[5]; Chen, Gang ^[5]

Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Theoretical Physics; State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, People’s Republic of China
Fudan Univ., Shanghai (China). School of Computer Science
Univ. of Toronto, ON (Canada). Canadian Inst. for Advanced Research, Dept. of Physics
Univ. of California, Santa Barbara, CA (United States). Kavli Inst. for Theoretical Physics
Fudan Univ., Shanghai (China). State Key Lab. of Surface Physics and Dept. of Physics; Fudan Univ., Shanghai (China). Center for Field Theory and Particle Physics, Dept. of Physics; Collaborative Innovation Center of Advanced Microstructures, Nanjing (China)

Frustrated 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.

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Research Organization:: Univ. of California, Santa Barbara, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: FG02-08ER46524

OSTI ID:: 1361676

Journal Information:: Nature Communications, Journal Name: Nature Communications Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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