非对称Anderson模型的重整微扰展开  

Renormalized perturbation expansion of asymmetric Anderson model

作　　者：黎欢[1] 

机构地区：[1]北京大学物理学院,北京100871

出　　处：《物理学报》2010年第11期8052-8062,共11页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10674005)资助的课题~~

摘　　要：利用Yamada微扰论结合重整微扰方法来计算非对称Anderson模型,得到了局域电子占据数、重整化因子、重整化的局域能级以及重整化参数关于裸参数的展开式.计算了局域电子态密度和低温杂质电导,还计算了磁场对它们的影响,这些结果适用于从弱耦合到强耦合的整个耦合强度区域.由于在哈密顿量中已经将局域能级进行了初步重整,采用的重整微扰方法比Hewson的重整微扰方法更适合于研究非对称Anderson模型.We generalize Yamada＇s perturbation theory and develop a renormalized perturbation method to study the asymmetric Anderson model.We obtain the occupancy of the local electrons,the renormalization factor,the renormalized energy level,and the renormalized parameters,which are expanded by the bare parameters.We also calculate the density of states of local electrons and the conductance of impurity scattering.The results coveres the range from weak to strong coupling.We find that the approach we adopted is more convenient than Hewson＇s renormalization method in studying the asymmetric Anderson model.

关 键 词：非对称Anderson模型 重整化 磁场 

分 类 号：O471.1[理学—半导体物理]