Rösch O, Gunnarsson O, Zhou X J, Yoshida T, Sasagawa T, Fujimori A, Hussain Z, Shen Z-X, Uchida S
Max-Planck-Institut für Festkörperforschung, D-70506 Stuttgart, Germany.
Phys Rev Lett. 2005 Nov 25;95(22):227002. doi: 10.1103/PhysRevLett.95.227002. Epub 2005 Nov 21.
We present angle-resolved photoemission spectroscopy (ARPES) data on undoped La2CuO4, indicating polaronic coupling between bosons and charge carriers. Using a shell model, we calculate the electron-phonon coupling and find that it is strong enough to give self-trapped polarons. We develop an efficient method for calculating ARPES spectra in undoped systems. Using the calculated couplings, we find the width of the phonon sideband in good agreement with experiment. We analyze reasons for the observed dependence of the width on the binding energy.
我们展示了未掺杂的La2CuO4的角分辨光电子能谱（ARPES）数据，表明玻色子与电荷载流子之间存在极化子耦合。使用壳层模型，我们计算了电子 - 声子耦合，发现其强度足以产生自陷极化子。我们开发了一种计算未掺杂系统中ARPES光谱的有效方法。利用计算出的耦合，我们发现声子边带的宽度与实验结果吻合良好。我们分析了观察到的宽度对结合能依赖性的原因。
