Electronic structure and optical properties of quantum rods with wurtzite structure


Autoria(s): Li XZ; Xia JB
Data(s)

2002

Resumo

The Hamiltonian of the wurtzite quantum rods with an ellipsoidal boundary is given after a coordinate transformation. The energies, wave functions, and transition possibilities are obtained as functions of the aspect ratio e with the same method we used on spherical dots. With an overall consideration of both the transition matrix element and the Boltzmann distribution we explained why the polarization factor increases with increasing e and approaches a saturation value, which tallies quite well with the experimental result. When e increases more and more S-z states are mixed into the ground, second, and third states of J(z)=1/2, resulting in an increase of the emission of z polarization. It is just the linear terms of the momentum operator in the hole Hamiltonian that cause the mixing of S and P states in the hole ground state. The effects of the crystal field splitting energy, temperature, and transverse radius to the polarization are also considered. We also calculated the band gap variation with the size and shape of the quantum rods.

Identificador

http://ir.semi.ac.cn/handle/172111/11774

http://www.irgrid.ac.cn/handle/1471x/64857

Idioma(s)

英语

Fonte

Li XZ; Xia JB .Electronic structure and optical properties of quantum rods with wurtzite structure ,PHYSICAL REVIEW B,2002 ,66 (11):Art.No.115316

Palavras-Chave #半导体物理 #SEMICONDUCTOR NANOCRYSTALS #DOTS #EMISSION #SPHERES
Tipo

期刊论文