Spatial pattern formation and polarization dynamics of a nonequilibrium spinor polariton condensate
Spatial pattern formation and polarization dynamics of a nonequilibrium spinor polariton condensate
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DOI：
10.1103/physrevb.81.235302
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发表时间：
2010-06-01
影响因子：
3.7
通讯作者：
Berloff, Natalia G.
中科院分区：
文献类型：
--
作者：
Borgh, Magnus O.;Keeling, Jonathan;Berloff, Natalia G.
半导体中的准粒子（如微腔极化子）可以形成凝聚体，其中的稳态密度分布由泵送和衰变的平衡决定。考虑极化子凝聚体的极化自由度，并考虑外加磁场的影响，从理论上讨论了极化动力学与抽运衰变凝聚体空间结构之间的相互作用。如果忽略空间结构，该动力学具有线性极化凝聚体（固定点）和非同步解（极限环）的吸引子，具有一定范围的双稳定性。考虑固定点的空间涨落，集体自旋模式可以是扩散的、线性色散的或间隙的。包括空间结构在内，自旋分量之间的相互作用会影响涡旋的动力学；产生稳定的共旋转和反旋转的涡旋和稀疏脉冲的复合体；不同的吸引子呈现不同的空间结构，增加了极化动力学极限环的可能范围。
Quasiparticles in semiconductors-such as microcavity polaritons-can form condensates in which the steady-state density profile is set by the balance of pumping and decay. By taking account of the polarization degree of freedom for a polariton condensate, and considering the effects of an applied magnetic field, we theoretically discuss the interplay between polarization dynamics, and the spatial structure of the pumped decaying condensate. If spatial structure is neglected, this dynamics has attractors that are linearly polarized condensates (fixed points), and desynchronized solutions (limit cycles), with a range of bistability. Considering spatial fluctuations about the fixed point, the collective spin modes can either be diffusive, linearly dispersing, or gapped. Including spatial structure, interactions between the spin components can influence the dynamics of vortices; produce stable complexes of vortices and rarefaction pulses with both co- and counter-rotating polarizations; and increase the range of possible limit cycles for the polarization dynamics, with different attractors displaying different spatial structures.