中国物理B ›› 2015, Vol. 24 ›› Issue (5): 50310-050310.doi: 10.1088/1674-1056/24/5/050310
保安a b, 张雪峰b, 章晓中a
Bao An (保安)a b, Zhang Xue-Feng (张雪峰)b, Zhang Xiao-Zhong (章晓中)a
摘要:
We investigate the effect of interaction, temperature, and anisotropic parameter on the quantum phase transitions in an anisotropic square-octagon lattice with fermions under the framework of the single band Hubbard model through using the combination of cellular dynamical mean field theory and a continuous time Monte Carlo algorithm. The competition between interaction and temperature shows that with the increase of the anisotropic parameter, the critical on-site repulsive interaction for the metal–insulator transition increases for fixed temperature. The interaction–anisotropic parameter phase diagram reveals that with the decrease of temperature, the critical anisotropic parameter for the Mott transition will increase for fixed interaction cases.
中图分类号: (Degenerate Fermi gases)