Journal
PHYSICS LETTERS A
Volume 362, Issue 1, Pages 86-89Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2006.11.066
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We argue that recently reported high resolution angle-resolved photoelectron spectra from cuprates, where an anomalous high-energy dispersion was identified, reveal the internal structure of the hole quasiparticle in quantum antiferromagnets and more importantly it is evidence for the existence of string-excitations which validate early predictions based on the t-J model. Their energy-momentum dispersion, the manner in which the spectral weight is transfered to higher energy string excitations, and the vanishing of the quasiparticle spectral weight near the F point, are all in agreement with predictions without adjusting any parameters. (c) 2006 Elsevier B.V. All rights reserved.
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