论文标题
$ 2D $ Hubbard模型的图解理论中的奇怪金属解决方案
Strange Metal Solution in the Diagrammatic Theory for the $2d$ Hubbard Model
论文作者
论文摘要
我们表明，$ 2D $ Hubbard模型的数值确切的大胆线图理论表现出非fermi-liquid（NFL）奇怪的金属状态，该状态在较强的相互作用限制下连接到Syk NFL。掺杂系统的解决方案具有预期的现象学，NFL在强耦合处接近半填充，并且在高温下原子态和低温下的费米液体所包围的广泛温度范围内。但是，我们证明了弱掺杂的制度中的这种行为是由于Luttinger-Ward-Ward功能的非物理分支所致。另一方面，我们的分析表明，NFL物理学是在更大的掺杂中实现的。
We show that the numerically exact bold-line diagrammatic theory for the $2d$ Hubbard model exhibits a non-Fermi-liquid (NFL) strange metal state, which is connected to the SYK NFL in the strong-interaction limit. The solution for the doped system features the expected phenomenology with the NFL near half-filling at strong couplings and in a wide temperature range enclosed by the atomic state at high temperatures and a Fermi liquid at low temperatures. We demonstrate, however, that this behavior in the weakly doped regime is due to the unphysical branch of the Luttinger-Ward functional. On the other hand, our analysis shows that the NFL physics is realized at larger doping.
