Size-dependence of the anharmonicities in the vibrational potential of colloidal CdSe nanocrystals

被引：29
|
作者：
Kusch, Patryk [1 ]
Lange, Holger [2 ]
Artemyev, Mikhail [3 ]
Thomsen, Christian [2 ]
机构：
[1] Free Univ Berlin, Inst Expt Phys, D-1000 Berlin, Germany
[2] Tech Univ Berlin, Inst Festkorperphys, D-1000 Berlin, Germany
[3] Belorussian State Univ, Inst Phys Chem Problems, Minsk, BELARUS
来源：
SOLID STATE COMMUNICATIONS | 2011年 / 151卷 / 01期
关键词：
Colloidal semiconductor nanocrystals; Phonons; Temperature dependence; Raman scattering; RAMAN-SCATTERING; PHONONS; SPECTRA; SILICON; SHAPE;
D O I：
10.1016/j.ssc.2010.10.023
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We investigated multi-phonon processes in two types of CdSe nanocrystals spherical quantum dots and nanorods by temperature-dependent Raman spectroscopy We find the anharmonic constants relating to the two- and three-phonon decay channels to systematically change with changing nanocrystal size The contributions from two-phonon processes decrease with decreasing diameter while the contributions from higher-order processes increase The anharmonicities in the vibrational potential increase due to the phonon confinement and we did not find a shape dependence (C) 2010 Elsevier Ltd All rights reserved
引用
收藏
页码：67 / 70
页数：4
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