Spin-orbital separation in the quasi-one-dimensional Mott insulator Sr2CuO3
When 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 i...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
18 April 2012
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| In: |
Nature
Year: 2012, Volume: 485, Pages: 82-85 |
| ISSN: | 1476-4687 |
| DOI: | 10.1038/nature10974 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1038/nature10974 Verlag, Volltext: https://www.nature.com/nature/journal/v485/n7396/full/nature10974.html 
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| Author Notes: | J. Schlappa, K. Wohlfeld, K.J. Zhou, M. Mourigal, M.W. Haverkort, V.N. Strocov, L. Hozoi, C. Monney, S. Nishimoto, S. Singh, A. Revcolevschi, J.-S. Caux, L. Patthey, H.M. Rønnow, J. van den Brink & T. Schmitt |
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| 245 | 1 | 0 | |a Spin-orbital separation in the quasi-one-dimensional Mott insulator Sr2CuO3 |c J. Schlappa, K. Wohlfeld, K.J. Zhou, M. Mourigal, M.W. Haverkort, V.N. Strocov, L. Hozoi, C. Monney, S. Nishimoto, S. Singh, A. Revcolevschi, J.-S. Caux, L. Patthey, H.M. Rønnow, J. van den Brink & T. Schmitt |
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| 500 | |a Gesehen am 02.11.2017 | ||
| 520 | |a When 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 orbital. The hallmark of one-dimensional physics is a breaking up of the elementary electron into its separate degrees of freedom. The separation of the electron into independent quasi-particles that carry either spin (spinons) or charge (holons) was first observed fifteen years ago. 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 quasiparticle with a substantial dispersion in energy over momentum, of about 0.2 electronvolts, over nearly one Brillouin zone. | ||
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