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arXiv 0904.2278cond-mat.mes-hallcond-mat.mtrl-sci
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CdTe0.68 Se 0.32纳米粒子在硼硅酸盐玻璃中的尺寸相关声学声子动力学

Size dependent Acoustic Phonon Dynamics of CdTe0.68Se0.32 Nanoparticles in Borosilicate glass

Sanjeev K. Gupta, Prafulla K. Jha, A. K. Arora

摘要:

采用弹性连续介质模型和固定边界条件,用两种不同的方法计算了CdTe 0.68Se 0.32纳米颗粒在硼硅酸盐玻璃中的低频声振动和声子线宽.介质的存在显著影响声子峰,导致模式展宽。发现线宽与尺寸成反比,与实验报道的结果相似。计算了阻尼时间和品质因数。皮秒量级的阻尼时间随着尺寸的减小而减小。l=2简正模的高品质因数值表明该模式的能量损失较小。

英文摘要:

Low frequency acoustic vibration and phonon linewidth for CdTe0.68Se0.32 nanoparticle embedded in borosilicate glass are calculated using two different approaches by considering the elastic continuum model and fixed boundary condition. The presence of medium significantly affects the phonon peaks and results into the broadening of the modes. The linewidth is found to depend inversely on the size, similar to that reported experimentally. The damping time and quality factor have also been calculated. The damping time that is of the order of picoseconds decreases with the decrease in size. High value of quality factor for l=2 normal mode suggests the less loss of energy for this mode.

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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