Distinct spinon and holon dispersions in photoemission spectral functions from one-dimensional SrCuO2
Distinct spinon and holon dispersions in photoemission spectral functions from one-dimensional SrCuO2
复制标题
DOI：
10.1038/nphys316
复制
发表时间：
2006-06-01
期刊：
影响因子：
19.6
通讯作者：
Kim, C.
中科院分区：
文献类型：
--
作者：
Kim, B. J.;Koh, H.;Kim, C.
自旋和电荷是电子不可分割的特征，但在一维固体中，理论预测它们会分离成集体模式--即称为自旋和合子的独立激发量子(或粒子)。长期以来，实验者一直试图验证这一效应。角分辨光电子能谱(ARPES)应该提供自旋-电荷分离的最直接证据，因为单个准粒子峰分裂成自旋-Holon双峰结构。尽管进行了广泛的ARPES实验，但对双峰结构的明确观察仍然难以捉摸。在这里，我们报告了最近的技术发展使来自SrCuO2的ARPES数据成为可能，这些数据明确地显示了自旋-Holon双峰结构及其不同的色散。自旋和Holon分支的能量标度分别为0.43 eV和1.3 eV，这与理论预测是一致的。
Spin and charge are inseparable traits of an electron, but in one-dimensional solids, theory predicts their separation into collective modes - as independent excitation quanta ( or particles) called spinons and holons. Experimentalists have long sought to verify this effect. Angle-resolved photoemission ( ARPES) should provide the most direct evidence of spin - charge separation, as the single quasiparticle peak splits into a spinon -holon two-peaklike structure. Despite extensive ARPES experiments, the unambiguous observation of the two-peak structure has remained elusive. Here we report ARPES data from SrCuO2, made possible by recent technological developments, that unequivocally show the spinon -holon two-peak structure and their distinct dispersions. The spinon and holon branches are found to have energy scales of similar to 0.43 and 1.3 eV, respectively, which are in quantitative agreement with the theoretical predictions.