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题名: Kitaev materials beyond iridates: Order by quantum disorder and Weyl magnons in rare-earth double perovskites
作者: Li, FY ;  Li, YD ;  Yu, Y ;  Paramekanti, A ;  Chen, G
刊名: PHYSICAL REVIEW B
出版日期: 2017
卷号: 95, 期号:8, 页码:85132
学科分类: Physics
DOI: http://dx.doi.org/10.1103/PhysRevB.95.085132
通讯作者: Chen, G (reprint author), Fudan Univ, Dept Phys, Ctr Field Theory & Particle Phys, State Key Lab Surface Phys, Shanghai 200433, Peoples R China. ;  Chen, G (reprint author), Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China. ;  Chen, G (reprint author), Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada.
文章类型: Article
英文摘要: Motivated by the experiments on the rare-earth double perovskites, we propose a generalized Kitaev-Heisenberg model to describe the generic interaction between the spin-orbit-entangled Kramers doublets of the rare-earth moments. We carry out a systematic analysis of the mean-field phase diagram of this new model. In the phase diagram, there exist large regions with a continuous U(1) or O(3) degeneracy. Since no symmetry of the model protects such a continuous degeneracy, we predict that the quantum fluctuation lifts the continuous degeneracy and favors various magnetic orders in the phase diagram. From this order by quantum disorder mechanism, we further predict that the magnetic excitations of the resulting ordered phases are characterized by nearly gapless pseudo-Goldstone modes. We find that there exist Weyl magnon excitations for certain magnetic orders. We expect our prediction to inspire further study of Kitaev physics, the order by quantum disorder phenomenon, and topological spin-wave modes in the rare-earth magnets and the systems alike.
类目[WOS]: Physics, Condensed Matter
关键词[WOS]: MAGNETIC-PROPERTIES ;  SPIN ;  ANTIFERROMAGNETS
项目资助者: Ministry of Science and Technology of People's Republic of China [2016YFA0301001] ;  NSERC of Canada ;  Start-Up Funds of Fudan University (Shanghai, People's Republic of China) ;  Thousand-Youth-Talent Program of People's Republic of China ;  Government of Canada through the Department of Innovation, Science and Economic Development Canada ;  Province of Ontario through the Ministry of Research, Innovation and Science
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/22120
Appears in Collections:理论物理所2017年知识产出_期刊论文

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Recommended Citation:
Li, FY,Li, YD,Yu, Y,et al. Kitaev materials beyond iridates: Order by quantum disorder and Weyl magnons in rare-earth double perovskites[J]. PHYSICAL REVIEW B,2017,95(8):85132.
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