Higgs mode and stability of xy-orbital ordering in Ca2RuO4

doi:10.1103/PhysRevB.101.205128

	Higgs mode and stability of xy-orbital ordering in Ca2RuO4
	Zhang, Guoren 1; Pavarini, Eva 2,3
刊名	PHYSICAL REVIEW B
	2020-05-18
卷号	101
ISSN号	2469-9950
DOI	10.1103/PhysRevB.101.205128
通讯作者	Zhang, Guoren()
英文摘要	We investigate the stability of xy orbital ordering and the nature of the magnetic longitudinal excitations in Ca2RuO4. To this end, we employ the local-density approximation + dynamical mean-field theory approach, in combination with many-body perturbation theory. We show that the crossover to a nonperturbative spin-orbit regime-in which xy-like orbital ordering is to a large extent quenched-only takes place when the crystal field is sizably reduced with respect to its actual value in Ca2RuO4. In the small crystal-field splitting limit, the spin-orbit interaction favors the metal-to-insulator transition. We find that the effects of the spin-orbit interaction remain perturbative even for the less distorted Ca2-xSrxRuO4 with 0 < x < 0.2 (S-Pbca phase) and for the S* phase. We show that, nevertheless, a Higgs mode at to omega similar to 50 meV is compatible with xy-like orbital ordering in Ca2RuO4.
资助项目	National Natural Science Foundation of China[11774349] ; Gauss Centre for Supercomputing e.V.
WOS关键词	GROUND-STATE ; CRYSTAL
WOS研究方向	Materials Science ; Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000533497100008
资助机构	National Natural Science Foundation of China ; Gauss Centre for Supercomputing e.V.
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/103327]
专题	中国科学院合肥物质科学研究院
通讯作者	Zhang, Guoren
作者单位	1.Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China 2.Forschungszentrum Julich, Inst Adv Simulat, D-52425 Julich, Germany 3.JARA High Performance Comp, D-52425 Julich, Germany
推荐引用方式 GB/T 7714	Zhang, Guoren,Pavarini, Eva. Higgs mode and stability of xy-orbital ordering in Ca2RuO4[J]. PHYSICAL REVIEW B,2020,101.
APA	Zhang, Guoren,&Pavarini, Eva.(2020).Higgs mode and stability of xy-orbital ordering in Ca2RuO4.PHYSICAL REVIEW B,101.
MLA	Zhang, Guoren,et al."Higgs mode and stability of xy-orbital ordering in Ca2RuO4".PHYSICAL REVIEW B 101(2020).