论文标题
二维Hubbard模型中的短距离电荷波动
Short-range charge fluctuations in the two-dimensional Hubbard model
论文作者
论文摘要
我们研究了二维Hubbard模型中的电荷波动，这是兴奋剂，相互作用强度，次要邻居的跳跃和八个位点动力群近似中的温度的函数。在中间相互作用强度的制度中，我们发现以前使用分析参数假定的$ d $密度波动是存在的，但不能解释为模型中伪群的原因，因为它们具有兴奋剂和相互作用强度的进化。对于距半填充的所有参数，调查的电荷波动（包括$ d $密度波动波动）弱于$ d $ - 波超导的波动。
We investigate charge fluctuations in the two-dimensional Hubbard model as a function of doping, interaction strength, next-nearest-neighbor hopping, and temperature within the eight-site dynamical cluster approximation. In the regime of intermediate interaction strengths, we find that $d$ density wave fluctuations, which had previously been postulated using analytical arguments, are present and strong but cannot be interpreted as the cause of the pseudogap in the model, due to their evolution with doping and interaction strength. For all parameters away from half filling, the charge fluctuations investigated, including $d$ density wave fluctuations, are weaker than $d$-wave superconducting fluctuations.
