层状钴氧化物系统的重整化群流

Renormalization Group Flow of Layered Co-based Oxides System

采用平均场近似方法得到层状钴氧化物系统的不对称Hubbard哈密顿量,建立了对应于该哈密顿量的重整化群流方程,求得相应的系统能带结构、粒子数期望值和临界温度.结果表明,系统发生绝缘体—金属转变的临界温度Tc随能带宽度W的降低而增大.

We adopted the way of mean field approximation to get the asymmetric Hubbard Hamiltonian and set up the equation of renormalization group flow for the layered Co-based oxides.The energy distribution and expectation values of particle number as well as critical temperature were calculated.The result indicated that critical temperature of insulator-metallic transition increases along with the width of energy band reducing.