Abstract
In this paper we expand on our earlier results [Phys. Rev. Lett. 77, 4054 (1996)] on angle-resolved photoemission studies on one-dimensional that reveal a behavior of a hole in Cu-O chain. The results cannot be explained within the conventional band theory, but require a picture in which the spin and charge degrees of freedom for a single electron are separated. Instead of a single branch as predicted in band theory, versus relationship can be explained by underlying spinon and holon excitations scaled by hopping energy and exchange energy respectively, indicating separated spin and charge excitations. This is an experimental observation of direct consequence of the spin-charge separation driven by electron correlations that was first predicted thirty years ago. It also shows spinon and holons are real particles with definite energy-momentum dispersions.
- Received 23 January 1997
DOI:https://doi.org/10.1103/PhysRevB.56.15589
©1997 American Physical Society