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Thermoelectric power of single-orbital and two-orbital Hubbard models on triangular lattices

机译:三角晶格上单轨道和双轨道哈伯德模型的热电功率

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摘要

The thermoelectric power of the single-orbital and two-orbital correlated electron systems on a twodimensional triangular lattice is investigated by the dynamical mean field theory with the exact diagonalization solver at finite temperature. It reveals that for the hole doping case, the geometrical frustration together with the Coulomb interaction greatly enhances thermoelectric power, in comparison with the electron doping case. In an anisotropic triangular lattice, we find a large thermoelectric power in the direction with small hopping integral in the anisotropic systems. In the two-orbital systems, we show that though the orbital entropy contributes to thermoelectric power, Hund's rule coupling may suppress the large thermoelectric power.
机译:利用动态平均场理论,利用精确的对角化求解器,在有限温度下研究了二维三角晶格上单轨道和双轨道相关电子系统的热电功率。结果表明,与电子掺杂情况相比,对于空穴掺杂情况,几何挫折以及库仑相互作用极大地增强了热电功率。在各向异性三角晶格中,我们在各向异性系统中发现了一个方向上的大热电功率,且跳变积分很小。在两轨道系统中,我们表明,尽管轨道熵有助于热电功率,但洪德法则耦合可能会抑制大的热电功率。

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