Possible observation of "string excitations" of a hole in a quantum antiferromagnet

Abstract

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 despersion as well as the manner in which the spectral weight is transfered to higher energy string excitations as well as the vanishing of the quasiparticle spectral weight near the $\Gamma$ point, are all in agreement with predictions without adjusting any parameters.

arXiv comment4 two-column pages, 3 BW figures, 1 color figure

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Cited by in corpus (12)

• "Waterfalls" phenomenon in superconducting cuprates
• "Waterfalls" in cuprates
• Momentum and excitation energy dependence of the "waterfalls" in cuprates
• High energy kink in the single particle spectra of the two-dimensional Hubbard model
• String excitations of a hole in a quantum antiferromagnet and photoelectron spectrospopy
• Temperature and doping dependence of high-energy kink in cuprates
• Paramagnon-induced dispersion anomalies in the cuprates
• Excitation energy map of the high-energy dispersion anomalies in cuprates
• High energy kink in the dispersion of a hole in an antiferromagnet -- double-occupancy effects on electronic excitations
• Finite temperature spectral function of a hole in a quantum antiferromagnet and role of phonons
• Hole spectral functions in lightly doped quantum antiferromagnets
• Machine-learning the spectral function of a hole in a quantum antiferromagnet