Spinor polariton condensates under nonresonant pumping: Steady states and elementary excitations

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	Spinor polariton condensates under nonresonant pumping: Steady states and elementary excitations
	Xu, Xingran; Hu, Ying; Zhang, Zhidong; Liang, Zhaoxin; Liang, ZX (reprint author), Zhejiang Normal Univ, Dept Phys, Jinhua 321004, Peoples R China.
刊名	AMER PHYSICAL SOC
	2017-10-20
卷号	96 期号:14 页码:-
ISSN号	2469-9950
英文摘要	We theoretically investigate a spinor polariton condensate under nonresonant pumping, based on driven-dissipative Gross-Pitaevskii equations coupled to the rate equation of a spin-unpolarized reservoir. We find the homogeneous polariton condensate can transit from the spin-unpolarized phase, where it is linearly polarized, to the spin-polarized phase, where it is elliptically polarized, depending on the cross-spin versus same-spin interactions and the linear polarization splitting. In both phases, we study elementary excitations using Bogoliubov approach, in a regime where the decay rate of total exciton density in reservoir crosses over from the slow to the fast limit. Depending on reservoir parameters, the global-phase mode can be either diffusive or gapped. By contrast, the relative-phase mode always possesses a gapped energy, undamped in the spin-unpolarized phase but weakly damped in the spin-polarized phase. In the spin-unpolarized phase, both modes are linearly polarized despite pumping and decay. However, in the spin-polarized phase, the mode polarization can be significantly affected by the reservoir and depends strongly on the circular polarization degree of the condensate. Interestingly, we demonstrate that the "ghost" branch of the Bogoliubov spectrum of the relative-phase mode can be visualized in the photoluminescence emission, distinguishable from that of the global-phase mode and thus allowing for experimental observation, when the spinor polariton condensate is elliptically polarized.; We theoretically investigate a spinor polariton condensate under nonresonant pumping, based on driven-dissipative Gross-Pitaevskii equations coupled to the rate equation of a spin-unpolarized reservoir. We find the homogeneous polariton condensate can transit from the spin-unpolarized phase, where it is linearly polarized, to the spin-polarized phase, where it is elliptically polarized, depending on the cross-spin versus same-spin interactions and the linear polarization splitting. In both phases, we study elementary excitations using Bogoliubov approach, in a regime where the decay rate of total exciton density in reservoir crosses over from the slow to the fast limit. Depending on reservoir parameters, the global-phase mode can be either diffusive or gapped. By contrast, the relative-phase mode always possesses a gapped energy, undamped in the spin-unpolarized phase but weakly damped in the spin-polarized phase. In the spin-unpolarized phase, both modes are linearly polarized despite pumping and decay. However, in the spin-polarized phase, the mode polarization can be significantly affected by the reservoir and depends strongly on the circular polarization degree of the condensate. Interestingly, we demonstrate that the "ghost" branch of the Bogoliubov spectrum of the relative-phase mode can be visualized in the photoluminescence emission, distinguishable from that of the global-phase mode and thus allowing for experimental observation, when the spinor polariton condensate is elliptically polarized.
学科主题	Physics, Condensed Matter
语种	英语
资助机构	National Natural Science Foundation of China [11274315, 11374125, 11434007, 51331006]; Youth Innovation Promotion Association of Chinese Academy of Sciences [2013125]; National Key R&D Program of China [2017YFA0304203]; Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China [IRT13076]; Fund for Shanxi "1331 Project" Key Subjects Construction
公开日期	2018-01-10
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79039]
专题	金属研究所_中国科学院金属研究所
通讯作者	Liang, ZX (reprint author), Zhejiang Normal Univ, Dept Phys, Jinhua 321004, Peoples R China.
推荐引用方式 GB/T 7714	Xu, Xingran,Hu, Ying,Zhang, Zhidong,et al. Spinor polariton condensates under nonresonant pumping: Steady states and elementary excitations[J]. AMER PHYSICAL SOC,2017,96(14):-.
APA	Xu, Xingran,Hu, Ying,Zhang, Zhidong,Liang, Zhaoxin,&Liang, ZX .(2017).Spinor polariton condensates under nonresonant pumping: Steady states and elementary excitations.AMER PHYSICAL SOC,96(14),-.
MLA	Xu, Xingran,et al."Spinor polariton condensates under nonresonant pumping: Steady states and elementary excitations".AMER PHYSICAL SOC 96.14(2017):-.