کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1814711 | 1025653 | 2009 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The phonon effects on the impurity states in cylindrical quantum wire with a finite confining potential The phonon effects on the impurity states in cylindrical quantum wire with a finite confining potential](/preview/png/1814711.png)
The variational method and the effective mass approximation are applied to calculate the binding energies of the hydrogenic impurity states in a cylindrical quantum wire with finite deep potential well. The phonon effects on the impurity states are considered by taking both the couplings of the electron–phonon and the impurity ion–phonon into account. The numerical results for the GaAs cylindrical quantum wire are given and discussed. It is found that the ion–phonon interaction reduces the impurity binding energy and supplies key contribution to the energy shift, but the electron–phonon coupling enhances the binding energy less. Longitudinal optical (LO) phonons play more important role than interface optical (IO) phonons in the impurity potential screening. The polaron effect caused by LO phonons is more important when the wire is thinner, otherwise the LO phonons are dominant for the thicker wires.
Journal: Physica B: Condensed Matter - Volume 404, Issue 16, 1 August 2009, Pages 2359–2363