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arXiv quant-ph/0612047quant-ph
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快速热退火控制单个InAs量子点的精细结构分裂

Control of fine-structure splitting of individual InAs quantum dots by rapid thermal annealing

D. J. P. Ellis, R. M. Stevenson, R. J. Young, P. Atkinson, D. A. Ritchie, A. J. Shields

摘要:

明亮的单激子自旋态的简并是量子点双激子衰变产生触发偏振纠缠光子对的先决条件。然而,通常,激子自旋状态由于面内不对称性而分裂。在这里,我们证明了一个单独的点的激子分裂可以通过热退火调整到零。重复退火蓝移的激子发射线的点,伴随着减少和反转的偏振分裂。退火也被证明可以控制在任何选定的点的激子和双激子跃迁之间的失谐。

英文摘要:

Degeneracy of the bright single exciton spin state is a prerequisite for the production of triggered polarization-entangled photon pairs from the biexciton decay of a quantum dot. Normally, however, the exciton spin states are split due to in-plane asymmetries. Here we demonstrate that the exciton splitting of an individual dot can be tuned through zero by thermal annealing. Repeated annealing blueshifts the exciton emission line of the dot, accompanied by a reduction and inversion in polarization splitting. Annealing is also demonstrated to control the detuning between the exciton and biexciton transitions in any selected dot.

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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