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Li W.-P.,Inner Mongolia Chifeng College | Yin J.-W.,Inner Mongolia Chifeng College | Yu Y.-F.,Inner Mongolia Chifeng College | Xiao J.-L.,Inner Mongolia University for Nationalities
Journal of Low Temperature Physics | Year: 2010

The condition of electric-LO phonon strong coupling in a parabolic quantum dot (QD) is studied in detail. We obtain the polaron ground state energy by the variational method of Pekar, considering the influence of the Rashba SO interaction. The relations on the polaron ground state energy with the parallel confinement length, the electron-LO phonon coupling constant and the perpendicular confinement length are derived for a parabolic quantum dot. © 2010 Springer Science+Business Media, LLC.


Li H.-J.,Inner Mongolia Chifeng College | Xiao J.-L.,Inner Mongolian University for Nationalities
Journal of Low Temperature Physics | Year: 2012

The ground-state lifetime of polaron in disk-shape quantum dot (QD) has been investigated by using the variational method of Pekar type. Quantum transition is occurred in the quantum system due to the electron-phonon interaction and the influence of temperature. That is the polaron transit from the ground-state to the first-excited state after absorbing a LO-phonon and it causes the changing of the polaron lifetime. The result shows that the ground-state lifetime increases with the increasing of the ground-state energy and decreases with the increasing of the electron-LO-phonon coupling strength, the temperature and the confinement length. We also see that the influence of the longitudinal confinement length on the lifetime is larger than the transverse confinement length. © 2012 Springer Science+Business Media, LLC.


Yin J.-W.,Inner Mongolia Chifeng College | Li W.-P.,Inner Mongolia Chifeng College | Yu Y.-F.,Inner Mongolia Chifeng College | Xiao J.-L.,Inner Mongolia University for Nationalities
Journal of Low Temperature Physics | Year: 2011

The bound polaron ground state energy is calculated by the variational method of Pekar considering the influence of the Rashba SO interaction on the condition of electric-LO phonon strong coupling in a parabolic quantum dot (QD). The relations on the bound polaron ground state energy with the parallel confinement length, the electron-LO phonon coupling constant, the perpendicular confinement length and the Coulomb binding parameter are derived for a parabolic quantum dot. © 2010 Springer Science+Business Media, LLC.


Hu Y.,Inner Mongolia Normal University | Hu Y.,Inner Mongolia Chifeng College | Song L.,Inner Mongolia Normal University | Wang G.,Inner Mongolia Normal University | And 2 more authors.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2011

The effects of substitution of Fe by Cr, Mn, Co and Ni on the structure, magnetic and magnetocaloric properties of LaFe11.5Si1.5 were investigated by means of X-ray diffraction and magnetic measurements. The results showed that the compounds investigated mainly crystallized in NaZn13-type cubic structure. For Cr, Mn, Co and Ni substituted compounds, the impurity phases were mainly 1.3% α-Fe and 2.5% LaFeSi, both Curie temperature and saturation magnetization decreased with these impurity phases in LaFe11.5Si1.5, while increased for Co-substitution. The thermal hysteresis reduced for all substitution. The maximum value of magnetic entropy change |ΔSm| for a magnetic field change of 0~5 T was about 23.8, 19.8, 26.4, 20.0 and 25.9 J · (kg · K)-1 for T=Cr, Mn, Fe, Co and Ni, respectively.


Yin J.,Inner Mongolia Chifeng College | Li W.,Inner Mongolia Chifeng College | Yu Y.,Inner Mongolia Chifeng College
Journal of Semiconductors | Year: 2013

The ground-state energy and the average number of virtual phonons around the electron in a parabolic quantum dot for the entire range of the electron - phonon coupling constant are obtained using the single-mode squeezed-state variational approach. The variational approach we applied is based on two successive canonical transformations and using a displaced-oscillator type unitary transformation to deal with the bilinear terms which are usually neglected. In order to study the relationship between the ground-state energy and the average number of virtual phonons around the electron of a polaron in a parabolic quantum dot with the electron - LO-phonon coupling constant and the confinement length, numerical calculations are carried out in the electron - LO-phonon strong- and weak-coupling regions. © 2013 Chinese Institute of Electronics.


Li W.-P.,Inner Mongolia Chifeng College | Yin J.-W.,Inner Mongolia Chifeng College | Yu Y.-F.,Inner Mongolia Chifeng College | Wang Z.-W.,Inner Mongolia Chifeng College | Xiao J.-L.,Inner Mongolia University for Nationalities
Journal of Low Temperature Physics | Year: 2010

On the condition of electric-LO phonon strong coupling in a parabolic quantum dot, we obtained the eigen energies and the eigenfunctions of the ground state and the first excited state by using the variational method of Pekar type. This system in a quantum dot may be employed as a two-level quantum system qubit. When the electron is in the superposition state of the ground state and the first excited state, we obtained the space-time evolution of the electron density. The relations on the cyclotron frequency with the electron probability density and the period of oscillation are derived in a parabolic quantum dot. © 2010 Springer Science+Business Media, LLC.

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