Kitaev materials beyond iridates: Order by quantum disorder and Weyl magnons in rare-earth double perovskites

doi:http://dx.doi.org/10.1103/PhysRevB.95.085132

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	Kitaev materials beyond iridates: Order by quantum disorder and Weyl magnons in rare-earth double perovskites
	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.
刊名	PHYSICAL REVIEW B
	2017
卷号	95 期号:8 页码:85132
DOI	http://dx.doi.org/10.1103/PhysRevB.95.085132
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.
学科主题	Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/22120]
专题	理论物理研究所_理论物理所1978-2010年知识产出
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.
推荐引用方式 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.