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arXiv 2006.01707cond-mat.str-el
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高温下哈伯德模型中的电荷输运:三角晶格与正方晶格

Charge transport in the Hubbard model at high temperatures: triangular versus square lattice

A. Vranic, J. Vucicevic, J. Kokalj, J. Skolimowski, R. Zitko, J. Mravlje, D. Tanaskovic

摘要:

高温坏金属输运作为强电子关联的关键特征之一,近年来在理论和实验上都得到了研究。在这里,我们使用动力学平均场论(DMFT)和它的集团扩展,以及有限温度Lanczos方法(FTLM),探讨在高温下的哈伯德模型的热力学和输运性质的晶格挫折的影响。我们考虑了三角形和正方形晶格在半填充和15%的空穴掺杂。我们发现,对于$T \gtrsim 1.5t$的自能变得几乎本地,而有限尺寸的影响变得很小,在晶格尺寸$4 \times 4$的晶格类型和掺杂水平。顶点校正的光学电导率,这是显着的正方形晶格,即使在高温下,贡献较小的三角形晶格。我们发现这两种类型的晶格的直流电阻率在掺杂莫特绝缘体的温度依赖性近似线性。

英文摘要:

High-temperature bad-metal transport has been recently studied both theoretically and in experiments as one of the key signatures of strong electronic correlations. Here we use the dynamical mean field theory (DMFT) and its cluster extensions, as well as the finite-temperature Lanczos method (FTLM) to explore the influence of lattice frustration on the thermodynamic and transport properties of the Hubbard model at high temperatures. We consider the triangular and the square lattice at half-filling and at 15\% hole-doping. We find that for $T \gtrsim 1.5t$ the self-energy becomes practically local, while the finite-size effects become small at lattice-size $4 \times 4$ for both lattice types and doping levels. The vertex corrections to optical conductivity, which are significant on the square lattice even at high temperatures, contribute less on the triangular lattice. We find approximately linear temperature dependence of dc resistivity in doped Mott insulator for both types of lattices.

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