论文标题
伪造的统一中间耦合描述和丘比特的奇怪金属阶段
Unified intermediate coupling description of the pseudogap and the strange metal phases of cuprates
论文作者
论文摘要
一个带有中间耦合的一个频带哈伯德模型可描述正常状态的两个最重要的异常特征：线性电阻率奇怪的金属和伪模。 Both the spectroscopic and transport properties of the cuprates are considered on the same footing by employing a relatively simple postgaussian approximation valid for the intermediate couplings $U/t=1.5-4$ in relevant temperatures $T>100{\rm K}.$ In the doping range $\ p=0.1-0.3$, the value of $U$ is smaller than that in the parent material.对于较小的掺杂，尤其是在Mott绝缘体阶段，与有效的紧密结合量表相比，耦合较大，并且需要不同的方法。为了描述奇怪的金属，这种情况为耦合应强的范式提供了一种替代方法，例如$ u/t> 6 $。我们认为，要获得现象学上可接受的正常状态特征，例如$ t^{\ ast} $，pseudogap值和光谱重量分布，$ u $的很大值是有害的。出乎意料的是，上述温度范围内的电阻率是线性$ρ=ρ_{0}+α\ frac {m^{\ ast}} {e^{2} n \ hbar} t $，带有“ planckian” cofflic of One of Order One的系数$α$。
A one band Hubbard model with intermediate coupling is shown to describe the two most important unusual features of a normal state: linear resistivity strange metal and the pseudogap. Both the spectroscopic and transport properties of the cuprates are considered on the same footing by employing a relatively simple postgaussian approximation valid for the intermediate couplings $U/t=1.5-4$ in relevant temperatures $T>100{\rm K}.$ In the doping range $\ p=0.1-0.3$, the value of $U$ is smaller than that in the parent material. For a smaller doping, especially in the Mott insulator phase, the coupling is large compared to the effective tight binding scale and a different method is required. This scenario provides an alternative to the paradigm that the coupling should be strong, say $U/t>6$, in order to describe the strange metal. We argue that to obtain phenomenologically acceptable underdoped normal state characteristics like $T^{\ast }$, pseudogap values, and spectral weight distribution, a large value of $U$ is detrimental. Surprisingly the resistivity in the above temperature range is linear $ρ=ρ_{0}+α\frac{m^{\ast }}{e^{2}n\hbar }T$ with the "Planckian" coefficient $α$ of order one.
