Gutzwiller method for heavy-fermion systems under a magnetic field

Kubo, Katsunori 

We study the periodic Anderson model under a magnetic field by the Gutzwiller method. In this study, we set the Coulomb interaction between electrons infinity, and we consider the variational wave function given by where excludes the double occupancy of electrons at the same site and is the number operator of the electron with spin at site . denotes the one-electron part of the wave function. We evaluate energy of the variational wave function by using Gutzwiller approximation, and determine the variational parameters in the one-electron part which minimize energy. Then, spin-dependent effective mass and magnetization under a magnetic field are obtained.