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arXiv 1602.04711physics.opticscond-mat.mes-hall
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极化子微腔中的半Skyrmion自旋织构

Half-Skyrmion Spin Textures In Polariton Microcavities

Pasquale Cilibrizzi, Helgi Sigurdsson, Tim C. H. Liew, Hamid Ohadi, Alexis Askitopoulos, Sebastian Brodbeck, Christian Schneider, Ivan A. Shelykh, Sven Höfling,… 展开作者

Pasquale Cilibrizzi, Helgi Sigurdsson, Tim C. H. Liew, Hamid Ohadi, Alexis Askitopoulos, Sebastian Brodbeck, Christian Schneider, Ivan A. Shelykh, Sven Höfling, Janne Ruostekoski, Pavlos Lagoudakis

摘要:

研究了非共振线偏振光激发下空间扩展极化激元凝聚体的极化动力学。的空间和时间分辨的极化激元发射揭示了非平凡的自旋纹理的形成,在线性和圆形斯托克斯参数的四重态偏振模式的形式,和对角斯托克斯参数的八重态。由于TE-TM分裂,极化激元赝自旋矢量通过凝聚体的连续旋转表现出与半整数拓扑数相关联的半skyrmions的有序模式。基于驱动耗散Gross-Pitaevskii方程和激子库的理论模型描述了通过光学自旋霍尔效应的非平凡自旋织构的动力学。

英文摘要:

We study the polarization dynamics of a spatially expanding polariton condensate under nonresonant linearly polarized optical excitation. The spatially and temporally resolved polariton emission reveals the formation of non-trivial spin textures in the form of a quadruplet polarization pattern both in the linear and circular Stokes parameters, and an octuplet in the diagonal Stokes parameter. The continuous rotation of the polariton pseudospin vector through the condensate due to TE-TM splitting exhibits an ordered pattern of half-skyrmions associated with a half-integer topological number. A theoretical model based on a driven-dissipative Gross-Pitaevskii equation coupled with an exciton reservoir describes the dynamics of the nontrivial spin textures through the optical spin-Hall effect.

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