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- Title
Distinct spinon and holon dispersions in photoemission spectral functions from one-dimensional SrCuO<sub>2</sub>.
- Authors
Kim, B. J.; Koh, H.; Rotenberg, E.; Oh, S.-J.; Eisaki, H.; Motoyama, N.; Uchida, S.; Tohyama, T.; Maekawa, S.; Shen, Z.-X.; Kim, C.
- Abstract
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-peak-like 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 ∼0.43 and 1.3 eV, respectively, which are in quantitative agreement with the theoretical predictions.
- Subjects
ELECTRON emission; PHOTOEMISSION; PARTICLE size determination; FIELD emission; QUANTITATIVE chemical analysis; NUCLEAR collective models
- Publication
Nature Physics, 2006, Vol 2, Issue 6, p397
- ISSN
1745-2473
- Publication type
Article
- DOI
10.1038/nphys316