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arXiv 2106.04479cond-mat.quant-gascond-mat.str-el
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二维费米-哈伯德模型中的输运:弱耦合的教训

Transport in the 2D Fermi-Hubbard Model: Lessons from Weak Coupling

Thomas G. Kiely, Erich J. Mueller

摘要:

利用量子动力学理论计算了弱耦合极限下二维单带费米-哈伯德模型的热电输运性质。对于一般的填充,我们发现,高温限制行为的电气($\sim T$)和热($\sim T^2$)的双折射率持续到温度的顺序跳频矩阵元素$T\sim t$,几乎一个数量级以下的带宽。在半填充,完美的嵌套导致异常低温散射和几乎$T$ -线性电阻率在所有温度下。我们假设,在最近的冷原子实验中观察到的$T$线性电阻率是连续连接到这个弱耦合物理,并建议实验验证的途径。我们发现了一些其他新的热电结果,如低温Wiedemann-Franz定律与洛伦兹系数$5π^2/36$。

英文摘要:

We use quantum kinetic theory to calculate the thermoelectric transport properties of the 2D single band Fermi-Hubbard model in the weak coupling limit. For generic filling, we find that the high-temperature limiting behaviors of the electrical ($\sim T$) and thermal ($\sim T^2$) resistivities persist down to temperatures of order the hopping matrix element $T\sim t$, almost an order of magnitude below the bandwidth. At half filling, perfect nesting leads to anomalous low temperature scattering and nearly $T$-linear electrical resistivity at all temperatures. We hypothesize that the $T$-linear resistivity observed in recent cold atom experiments is continuously connected to this weak coupling physics and suggest avenues for experimental verification. We find a number of other novel thermoelectric results, such as a low-temperature Wiedemann-Franz law with Lorenz coefficient $5π^2/36$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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