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题名: Optical spectra of CdSe nanocrystals under hydrostatic pressure
作者: Li JB;  Li GH;  Xia JB;  Zhang JB;  Lin Y;  Xiao XR
发表日期: 2001
摘要: Optical spectra of CdSe nanocrystals are measured at room temperature under pressure ranging from 0 to 5.2 GPa. The exciton energies shift linearly with pressure below 5.2 GPa. The pressure coefficient is 27 meV GPa(-1) for small CdSe nanocrystals with the radius of 2.4 nm. With the approximation of a rigid-atomic pseudopotential, the pressure coefficients of the energy band are calculated. By using the hole effective-mass Hamiltonian for the semiconductors with wurtzite structure under various pressures, we study the exciton states and optical spectra for CdSe nanocrystals under hydrostatic pressure in detail. The intrinsic asymmetry of the hexagonal lattice structure and the effect of spin-orbit coupling on the hole states are investigated. The Coulomb interaction of the exciton states is also taken into account. It is found that the theoretical results are in good agreement with the experimental values.
KOS主题词: Semiconductor nanocrystals;  Quantum dots;  Electronic structure;  Raman effect;  absorption;  transition;  wurtzite
刊名: JOURNAL OF PHYSICS-CONDENSED MATTER
专题: 中国科学院半导体研究所(2009年前)_期刊论文

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推荐引用方式:
Li JB; Li GH; Xia JB; Zhang JB; Lin Y; Xiao XR .Optical spectra of CdSe nanocrystals under hydrostatic pressure ,JOURNAL OF PHYSICS-CONDENSED MATTER,2001 ,13(9):2033-2043
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