Distinct spinon and holon dispersions in photoemission spectral functions from one-dimensional SrCuO2.

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Title:	Distinct spinon and holon dispersions in photoemission spectral functions from one-dimensional SrCuO2.
Authors:	Kim, B. J.¹ bjkim6@gmail.com, Koh, H.², Rotenberg, E.², Oh, S.-J.¹, Eisaki, H.³, Motoyama, N.⁴, Uchida, S.⁴, Tohyama, T.⁵, Maekawa, S.^5,6, Shen, Z.-X.⁷, Kim, C.⁸ cykim@phya.yonsei.ac.kr
Source:	Nature Physics. Jun2006, Vol. 2 Issue 6, p397-401. 5p. 2 Diagrams, 3 Graphs.
Subjects:	Electron emission, Photoemission, Particle size determination, Field emission, Quantitative chemical analysis, Nuclear collective models
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. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

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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. [ABSTRACT FROM AUTHOR]
ISSN:	17452473
DOI:	10.1038/nphys316