Distinct Spinon And Holon Dispersions in Photoemission Spectral Functions From One-Dimensional SrCuO2
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 SrCuO{sub 2}, 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 {approx}0.43 and 1.3 eV, respectively, which are in quantitative agreement with the theoretical predictions.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 889174
- Report Number(s):
- SLAC-REPRINT-2006-108; TRN: US200619%%693
- Journal Information:
- Nature Physics, Vol. 2
- Country of Publication:
- United States
- Language:
- English
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Distinct spinon and holon dispersions in photoemission spectralfunctions from one-dimensional SrCuO2