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Li, FY; Li, YD; Yu, Y; Paramekanti, A; Chen, G; 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.
Kitaev materials beyond iridates: Order by quantum disorder and Weyl magnons in rare-earth double perovskites
Source PublicationPHYSICAL REVIEW B
Language英语
AbstractMotivated 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.
2017
Volume95Issue:8Pages:85132
Subject AreaPhysics
DOIhttp://dx.doi.org/10.1103/PhysRevB.95.085132
Funding OrganizationMinistry of Science and Technology of People's Republic of China [2016YFA0301001] ; Ministry of Science and Technology of People's Republic of China [2016YFA0301001] ; Ministry of Science and Technology of People's Republic of China [2016YFA0301001] ; Ministry of Science and Technology of People's Republic of China [2016YFA0301001] ; NSERC of Canada ; NSERC of Canada ; NSERC of Canada ; NSERC of Canada ; Start-Up Funds of Fudan University (Shanghai, People's Republic of China) ; Start-Up Funds of Fudan University (Shanghai, People's Republic of China) ; Start-Up Funds of Fudan University (Shanghai, People's Republic of China) ; Start-Up Funds of Fudan University (Shanghai, People's Republic of China) ; Thousand-Youth-Talent Program of People's Republic of China ; Thousand-Youth-Talent Program of People's Republic of China ; Thousand-Youth-Talent Program of 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 ; Government of Canada through the Department of Innovation, Science and Economic Development Canada ; Government of Canada through the Department of Innovation, Science and Economic Development Canada ; Government of Canada through the Department of Innovation, Science and Economic Development Canada ; Province of Ontario through the Ministry of Research, Innovation and Science ; Province of Ontario through the Ministry of Research, Innovation and Science ; Province of Ontario through the Ministry of Research, Innovation and Science ; Province of Ontario through the Ministry of Research, Innovation and Science
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/22120
Collection理论物理所科研产出_SCI论文
Corresponding AuthorChen, 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.
Recommended Citation
GB/T 7714
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.
APA Li, FY.,Li, YD.,Yu, Y.,Paramekanti, A.,Chen, G.,...&Chen, G .(2017).Kitaev materials beyond iridates: Order by quantum disorder and Weyl magnons in rare-earth double perovskites.PHYSICAL REVIEW B,95(8),85132.
MLA Li, FY,et al."Kitaev materials beyond iridates: Order by quantum disorder and Weyl magnons in rare-earth double perovskites".PHYSICAL REVIEW B 95.8(2017):85132.
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