Lifshitz transitions in magnetic phases of the periodic Anderson model

周期アンダーソンモデルの磁性相におけるリフシッツ転移

久保 勝規 

Kubo, Katsunori

We investigate the reconstruction of a Fermi surface, which is called a Lifshitz transition, in magnetically ordered phases of the periodic Anderson model on a square lattice with a finite Coulomb interaction between electrons. We apply the variational Monte Carlo method to the model by using the Gutzwiller wave functions for the paramagnetic, antiferromagnetic, ferromagnetic, and charge-density-wave states. We find that an antiferromagnetic phase is realized around half-filling and a ferromagnetic phase is realized when the system is far away from half-filling. In both magnetic phases, Lifshitz transitions take place. By analyzing the electronic states, we conclude that the Lifshitz transitions to large ordered-moment states can be regarded as itinerant-localized transitions of the electrons.