双导带Anderson晶格的Slave-Boson平均场理论

应用Slave-Boson技术和泛函积分方法,处理了双导带Anderson晶格模型。在鞍点近似下,求得了系统的电子态密度和一些低温热力学量。结果表明,由于系统的相干性和f-c混合作用,电子态密度在费密面附近出现赝能隙结构。系统的低温热力学量具有重费密子特性。关键词：

A SLAVE-BOSON MEAN FIELD THEORY FOR THE TWO-CONDUCTION BAND LATTICE ANDERSON MODEL

A two-conduction band lattice Anderson hamiltonian is studied by the Slave-Boson technique and the functional integral method. The electronic density of states (DOS) of the system as well as low temperature thermodynamic quantities are obtained under the saddle point approximation. The results show that a pseudo-gap structure in DOS appears near the Fermi level due to the f-c hybridization and the coherence effect, and the low temperature thermodynamic quantities of the system possess the heavy-fermion properties.