摘要
本文应用幺正变换和线性组合算符法研究了极性晶体内强耦合磁极化子的平均数 与磁场Ｂ和温度Ｔ之间的依赖关系。讨论了在不同的近似计算程度情况下，磁极化子平均数与磁场和温度的特性。对ＲｂＣｌ晶体所作的数值计算结果表明：当计算的近似程度较低时，磁极化子的平均数随温度的升高而减小，但随磁场的加强而增大；当计算的近似程度较高时，磁极化子的平均数随温度的升高而增大，但随磁场的加强而减小。
With the development of magneto-optical technology, the properties of the polaron in magnetic field have been of considerable interest. Larsen proposed a novel operator method to investigate the properties of 2D polarons. Peeters et al. discussed the properties of the magnetopolaron using the Feynmann path-integral approach. Wei and co-workers studied the induced potential and the self-energy of an interface magnetopolaron using the Green-function method. Huybrechts proposed a linear combination operator method, by which a strong coupling polaron was discussed. Later, many scholars studied the strong coupling polaron in many aspects by this method. The properties of the surface magnetopolaron have been discussed by the method of a linear combination operator and a perturbation by the present authors and co-werkers. In fact, the case of finite temperature is more significant. A lot of scholars studied the properties of the temperature of a polaron by a variety of different theoretical method. Saitok obtained that the effective mass of a polaron decreases with increasing temperature by means of the Feynmann path-integral approach. Many scholars got a alike conclusion also. This conclusion has been gained by the present authors and co-workers. However, Gu acquired an opposite result. Later, we studied the temperature dependence of the effective mass of the strong coupling magnetopolaron in polar crystals by means of the unitary transformation and an improved linear combination operator method again. The temperature characteristic of the effective mass was discussed in detail at different approximation calculation level. The result illustrated that the different approximation calculation level could provide two completely contrary conclusions on temperature depen- dence of the effective mass of the magnetopolaron. Using the different approximation calculation level, one can provide two complety contrary conclusions on temperature dependence of not only the effective mass of the magnetopolaron but also other of the mag- netopolaron. In this paper, the relationship between the mean number of strong coupling magnetopolaron in polar crystal and magnetic field B and temperature T are studied by the method of the unitary transfor- mation and the linear combination operator. The magnetic field and temperature dependences of the mean number of the magnetopolaron are discussed in the different approximation calculation level. Numerical cal- culation for the RbCl crystal, as an example, are performed. The mean number of the magnetopolaron decreases with increasing temperature and increases with increasing magnetic field when the approximation calculation level is lower. The mean number of the magnetopolaron increases with increasing temperature and decreases with increasing magnetic field when the approximation calculation level is higher.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2001年第4期343-346,共4页
Chinese Journal of Luminescence
基金
中国科学院激发态物理开放研究实验室
内蒙古自然科学基金资助课题(99009)
关键词
近似程度
强耦合
磁极化子
平均数
温度特性
磁场特性
半导体
approximation calculation level
strong coupling
mean number of the magnetopolaron
properties of temperature
properties of magnetic field
