Liebsch A
Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany.
Phys Rev Lett. 2005 Sep 9;95(11):116402. doi: 10.1103/PhysRevLett.95.116402. Epub 2005 Sep 8.
The Mott transition in a two-band Hubbard model involving subbands of different widths is studied as a function of temperature using dynamical mean field theory combined with exact diagonalization. The phase diagram is shown to exhibit two successive first-order transitions if the full Hund's rule coupling is included. In the absence of spin-flip and pair-exchange terms the lower transition remains first-order while the upper becomes continuous.
利用动力学平均场理论结合精确对角化方法，研究了包含不同宽度子带的两能带哈伯德模型中的莫特转变随温度的变化。如果包含完整的洪德规则耦合，则相图显示出两个连续的一级转变。在没有自旋翻转和对交换项的情况下，较低的转变仍然是一级的，而较高的转变变为连续的。
