In this paper,on the basis of Huybrechts' strong-coupling polaron model,the Tokuda modified linear-combination operator method and the unitary transformation method are used to study the properties of the strong-c...In this paper,on the basis of Huybrechts' strong-coupling polaron model,the Tokuda modified linear-combination operator method and the unitary transformation method are used to study the properties of the strong-coupling bound polaron considering the influence of Rashba effect,which is brought by the spin-orbit (SO) interaction,in the semiconductor triangular quantum well (TQW).Numerical calculation on the RbCl TQW,as the example,isperformed.The expressions for the effective mass of the polaron as a function of the vibration frequency,the velocity,the Coulomb bound potential and the electron areal density are derived.Numerical results show that the total effectivemass of the polaron is composed of three parts.The interactions between the orbit and the spin with different directionshave different effects on the effective mass of the bound polaron.展开更多
On the condition of electric-LO phonon strong coupling in a parabolic quantum dot,we obtain theeigenenergy and the eigenfunctions of the ground state and the first-excited state using the variational method ofPekar ty...On the condition of electric-LO phonon strong coupling in a parabolic quantum dot,we obtain theeigenenergy and the eigenfunctions of the ground state and the first-excited state using the variational method ofPekar type.This system in a quantum dot may be employed as a two-level quantum system-qubit.When the electronis in the superposition state of the ground state and the first-excited state,we obtain the time evolution of the electrondensity.The relations of the probability density of electron on the temperature and the electron-LO-phonon couplingconstant and the relations of the period of oscillation on the temperature,the electron-LO-phonon coupling constant,the Coulomb binding parameter and the confinement length are derived.The results show that the probability densityof electron oscillates with a period when the electron is in the superposition state of the ground and the first-excitedstate,and show that there are different laws that the probability density of electron and the period of oscillation changewith the temperature and the electron-LO-phonon coupling constant when the temperature is lower or higher.Andit is obtained that the period of oscillation decreases with increasing the Coulomb bound potential and increases withincreasing the confinement length not only at lower temperatures but also at higher temperatures.展开更多
On the condition of electric-LO phonon strong coupling in unsymmetrical parabolic confinement potentialquantum dot(QD),we obtain the eigenenergies of the ground state and the first-excited state,the eigenfunetions oft...On the condition of electric-LO phonon strong coupling in unsymmetrical parabolic confinement potentialquantum dot(QD),we obtain the eigenenergies of the ground state and the first-excited state,the eigenfunetions ofthe ground state,and the first-excited state by using variational method of Pekar type.This system in QD may beemployed as a two-level quantum system-qubit.When the electron is in the superposition state of the ground state andthe first-excited state,we obtain the time evolution of the electron density.The relations both the probability density ofelectron and the period of oscillation with the eleetron-LO-phonon coupling strength,the confinement strengths in thexy-plane and the z-direction are discussed.展开更多
基金National Natural Science Foundation of China under Grant No.10347004
文摘In this paper,on the basis of Huybrechts' strong-coupling polaron model,the Tokuda modified linear-combination operator method and the unitary transformation method are used to study the properties of the strong-coupling bound polaron considering the influence of Rashba effect,which is brought by the spin-orbit (SO) interaction,in the semiconductor triangular quantum well (TQW).Numerical calculation on the RbCl TQW,as the example,isperformed.The expressions for the effective mass of the polaron as a function of the vibration frequency,the velocity,the Coulomb bound potential and the electron areal density are derived.Numerical results show that the total effectivemass of the polaron is composed of three parts.The interactions between the orbit and the spin with different directionshave different effects on the effective mass of the bound polaron.
基金Supported by National Natural Science Foundation of China under Grant No.10747002Research Funds from Qufu Normal University under Grant No.XJZ200839
文摘On the condition of electric-LO phonon strong coupling in a parabolic quantum dot,we obtain theeigenenergy and the eigenfunctions of the ground state and the first-excited state using the variational method ofPekar type.This system in a quantum dot may be employed as a two-level quantum system-qubit.When the electronis in the superposition state of the ground state and the first-excited state,we obtain the time evolution of the electrondensity.The relations of the probability density of electron on the temperature and the electron-LO-phonon couplingconstant and the relations of the period of oscillation on the temperature,the electron-LO-phonon coupling constant,the Coulomb binding parameter and the confinement length are derived.The results show that the probability densityof electron oscillates with a period when the electron is in the superposition state of the ground and the first-excitedstate,and show that there are different laws that the probability density of electron and the period of oscillation changewith the temperature and the electron-LO-phonon coupling constant when the temperature is lower or higher.Andit is obtained that the period of oscillation decreases with increasing the Coulomb bound potential and increases withincreasing the confinement length not only at lower temperatures but also at higher temperatures.
文摘On the condition of electric-LO phonon strong coupling in unsymmetrical parabolic confinement potentialquantum dot(QD),we obtain the eigenenergies of the ground state and the first-excited state,the eigenfunetions ofthe ground state,and the first-excited state by using variational method of Pekar type.This system in QD may beemployed as a two-level quantum system-qubit.When the electron is in the superposition state of the ground state andthe first-excited state,we obtain the time evolution of the electron density.The relations both the probability density ofelectron and the period of oscillation with the eleetron-LO-phonon coupling strength,the confinement strengths in thexy-plane and the z-direction are discussed.
