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

被引：37

作者：

Han, Peng ^{[1
]}

Bester, Gabriel ^{[1
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 04期

关键词：

QUANTUM; PHONONS; MODES;

D O I：

10.1103/PhysRevB.85.041306

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a first-principles study of the confinement effects on the vibrational properties of thousand atoms (radii up to 16.2 angstrom) 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.

引用

页数：4

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