Phase diagram of the Mott transition in a two-band Hubbard model in infinite dimensions
Phase diagram of the Mott transition in a two-band Hubbard model in infinite dimensions
复制标题
无限维两能带 Hubbard 模型中莫特跃迁的相图
DOI：
10.1007/s100510170313
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
A. Hewson
中科院分区：
文献类型：
--
作者：
Y. Ono;R. Bulla;A. Hewson
本文用Bulla和Potthoff最近发展的线性化动力学平均场理论研究了无限维双带Hubbard模型中的Mott金属-绝缘体相变。通过分析得到了金属-绝缘体相变的相界是d轨道上的在位库仑相互作用、p轨道和d轨道之间的电荷转移能以及p-d、d-d和p-轨道之间的跳跃积分的函数。所得结果与精确对角化方法的数值结果吻合较好。
The Mott metal-insulator transition in the two-band Hubbard model in infinite dimensions is studied by using the linearized dynamical mean-field theory recently developed by Bulla and Potthoff. The phase boundary of the metal-insulator transition is obtained analytically as a function of the on-site Coulomb interaction at thed-orbital, the charge-transfer energy between thed- andp-orbitals and the hopping integrals betweenp-d,d-dandp-porbitals. The result is in good agreement with the numerical results obtained from the exact diagonalization method.