Details

Autor(en) / Beteiligte

• 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.

Titel

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

Ist Teil von

• Nature physics, 2006-06, Vol.2 (6), p.397-401

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2006

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 approximately 0.43 and 1.3 eV, respectively, which are in quantitative agreement with the theoretical predictions. [PUBLICATION ABSTRACT]