Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
Phys Rev Lett. 2010 Dec 31;105(26):267003. doi: 10.1103/PhysRevLett.105.267003. Epub 2010 Dec 28.
We have investigated the electronic states in quasi-one-dimensional CuO chains by microprobe angle resolved photoemission spectroscopy. We find that the quasiparticle Fermi surface consists of six disconnected segments, consistent with recent theoretical calculations that predict the formation of narrow, elongated Fermi surface pockets for coupled CuO chains. In addition, we find a strong renormalization effect with a significant kink structure in the band dispersion. The properties of this latter effect [energy scale (∼40 meV), temperature dependence, and behavior with Zn-doping] are identical to those of the bosonic mode observed in CuO2 planes of high-temperature superconductors, indicating they have a common origin.
我们通过微探针角分辨光发射谱研究了准一维 CuO 链中的电子态。我们发现准粒子费米面由六个不连续的片段组成，这与最近的理论计算结果一致，该结果预测了耦合 CuO 链形成狭窄、拉长的费米面口袋。此外，我们还发现了能带色散中具有显著拐点结构的强重整化效应。后一种效应的性质（约 40 meV 的能量标度、温度依赖性以及与 Zn 掺杂的行为）与在高温超导体的 CuO2 平面中观察到的玻色模式相同，表明它们具有共同的起源。
