首页> 外文会议>International Conference on Magnetic and Superconducting Materials(MSM'05); 20050905-08; Agadir(MA) >Decoherence effects due to exciton-phonon interaction in CdSe quantum dots: Contribution of the piezoelectricity and deformation potential couplings
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Decoherence effects due to exciton-phonon interaction in CdSe quantum dots: Contribution of the piezoelectricity and deformation potential couplings

机译:CdSe量子点中由于激子-声子相互作用引起的退相干效应:压电和形变电势耦合的贡献

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We analyse decoherence effects of an exciton in II-VI semiconductor quantum dot. We calculate the scattering rate of excitons by acoustic phonons laying a foundation for work on understanding carrier relaxation in quantum dots providing then a basis for studying decoherence phenomena in these systems. We considered two exciton-acoustic phonons scattering mechanisms the standard deformation potential coupling and the piezoelectric coupling. The latter was found to be relatively important in large dots. We discuss the influence of an external applied magnetic field and the dot size on the scattering rate. We show that it depends strongly on the quantum dot size, then using a modulated external magnetic field the interaction of the exciton and acoustic phonon modes can be modified in a wide range.
机译:我们分析了II-VI半导体量子点中激子的退相干效应。我们通过声子计算激子的散射速率,为理解量子点中的载流子弛豫奠定了基础,从而为研究这些系统中的退相干现象奠定了基础。我们考虑了两种激子-声子声子散射机制,标准形变势耦合和压电耦合。发现后者在大点中相对重要。我们讨论了外部施加的磁场和点大小对散射速率的影响。我们表明,它在很大程度上取决于量子点的大小,然后使用调制的外部磁场,激子和声子声子模的相互作用可以在很宽的范围内进行修改。

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