Physics Department, University of California, Santa Cruz, California 95064, USA.
Phys Rev Lett. 2011 Jul 29;107(5):056403. doi: 10.1103/PhysRevLett.107.056403.
We present the theory of an extremely correlated Fermi liquid with U→∞. This liquid has an underlying auxiliary Fermi liquid Green's function that is further caparisoned by extreme correlations. The theory leads to two parallel hierarchies of equations that permit iterative approximations in a certain parameter. Preliminary results for the spectral functions display a broad background and a distinct T dependent left skew. An important energy scale Δ(k[over →],x) emerges as the average inelasticity of the FL Green's function, and influences the photoemission spectra profoundly. A duality is identified wherein a loss of coherence of the ECFL results from an excessively sharp FL.
我们提出了一个在 U→∞情况下的强关联费米液体理论。这个液体有一个潜在的辅助费米液体格林函数，它被进一步被极端关联所描述。这个理论导致了两个平行的方程层次，可以在某个参数下进行迭代近似。对谱函数的初步结果显示了一个宽的背景和一个明显的 T 相关的左偏。一个重要的能量标度 Δ(k[over →],x)出现了，它是 FL 格林函数的非弹性平均，并且对光电子谱有深远的影响。一个对偶性被确定，其中 ECFL 的相干性的丧失来自于过于尖锐的 FL。
