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Spin–orbital separation in the quasi-one-dimensional Mott insulator Sr2CuO3

SprMorn 添加于 2012/4/20 10:50:04  2915次阅读 | 1次推荐 | 0个评论

hen viewed as an elementary particle, the electron has spin and charge. When binding to the atomic nucleus, it also acquires an angular momentum quantum number corresponding to the quantized atomic orbital it occupies. Even if electrons in solids form bands and delocalize from the nuclei, in Mott insulators they retain their three fundamental quantum numbers: spin, charge and orbital1. The hallmark of one-dimensional physics is a breaking up of the elementary electron into its separate degrees of freedom2. The separation of the electron into independent quasi-particles that carry either spin (spinons) or charge (holons) was first observed fifteen years ago3. Here we report observation of the separation of the orbital degree of freedom (orbiton) using resonant inelastic X-ray scattering on the one-dimensional Mott insulator Sr2CuO3. We resolve an orbiton separating itself from spinons and propagating through the lattice as a distinct quasi-particle with a substantial dispersion in energy over momentum, of about 0.2 electronvolts, over nearly one Brillouin zone

作 者:J. Schlappa,1, 2 K. Wohlfeld,3 K. J. Zhou,1, 9 M. Mourigal,4 M. W. Haverkort,5 V. N. Strocov,1 L. Hozoi,3 C. Monney,1 S. Nishimoto,3 S. Singh,6, 9 A. Revcolevschi,6 J.-S. Caux,7 L. Patthey,1, 8 H. M. Rønnow,4 J. van den Brink3 & T. Schmitt1
期刊名称: nature
期卷页: 第卷 第期 ~页
学科领域:数理科学 » 物理学 » 原子和分子物理
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原文链接:http://www.nature.com/nature/journal/vaop/ncurrent/full/nature10974.html
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