arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1202.1634cond-mat.mes-hallcond-mat.mtrl-sci
收藏

限制效应对III-V和II-VI纳米团簇振动性质的影响

Confinement effects on the vibrational properties of III-V and II-VI nanoclusters

Peng Han, Gabriel Bester

摘要:

我们提出了一个第一性原理研究的限制上千原子(半径高达16.2毫米)的胶体III-V和II-VI纳米团簇的振动特性的影响。我们描述了分子型的振动,如表面光学,表面声学和相干声学模式,共存和相互作用与批量型的振动,如纵向和横向的声学和光学模式。我们链接振动特性的表面引起的结构变化,并强调III-V和II-VI之间的质的差异。我们描述的振动的大小依赖性,并找到很好的协议的拉曼位移和相干声学模式的频率与实验。

英文摘要:

We present a first-principles study of the confinement effects on the vibrational properties of thousand atoms (radii up to 16.2 Å) colloidal III-V and II-VI nanoclusters. We describe how the molecular-type vibrations, such as surface--optical, surface--acoustic and coherent acoustic modes, coexist and interact with bulk-type vibrations, such as longitudinal and transverse acoustic and optical modes. We link vibrational properties to structural changes induced by the surface and highlight the qualitative difference between III-Vs and II-VIs. We describe the size dependence of the vibrations and find good agreement for Raman shifts and for the frequency of coherent acoustic modes with experiments.

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。

↑