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arXiv 1002.2322cond-mat.mes-hallcond-mat.stat-mech
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量子点超辐射动力学

Dynamics of quantum dot superradiance

V. I. Yukalov, E. P. Yukalova

摘要:

考虑了通过量子点组装实现电磁辐射超辐射的可能性。详细分析了整个动力学过程。它表明,可以发生几个不同的性质的演变阶段。这个过程开始于偶极波触发单个点的自发辐射。这对应于波动阶段,此时点还没有明显地彼此相关。第二个阶段是量子阶段,此时通过公共辐射场的点相互作用变得更加重要,但相干性尚未发展。第三个阶段是相干阶段,当点相干辐射时,发出超辐射脉冲。在超辐射脉冲之后,点系统在弛豫阶段弛豫到非相干态。如果没有外部永久泵浦,或者有效的点相互作用很弱,系统在最后的稳定阶段趋于稳定状态,此时相干性消失到一个低的,几乎可以忽略的水平。在永久泵浦的情况下,存在第六阶段的脉冲超辐射,当系统的点发射单独的相干脉冲。

英文摘要:

The possibility of realizing the superradiant regime of electromagnetic emission by the assembly of quantum dots is considered. The overall dynamical process is analyzed in detail. It is shown that there can occur several qualitatively different stages of evolution. The process starts with dipolar waves triggering the spontaneous radiation of individual dots. This corresponds to the fluctuation stage, when the dots are not yet noticeably correlated with each other. The second is the quantum stage, when the dot interactions through the common radiation field become more important, but the coherence is not yet developed. The third is the coherent stage, when the dots radiate coherently, emitting a superradiant pulse. After the superradiant pulse, the system of dots relaxes to an incoherent state in the relaxation stage. If there is no external permanent pumping, or the effective dot interactions are weak, the system tends to a stationary state during the last stationary stage, when coherence dies out to a low, practically negligible, level. In the case of permanent pumping, there exists the sixth stage of pulsing superradiance, when the system of dots emits separate coherent pulses.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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