Sharp Photoemission Spactra in the Quantum Antiferromagnet

Details Sharp Photoemission Spactra in the Quantum Antiferromagnet Sharp Photoemission Spactra in the Quantum Antiferromagnet

1995-11-23

arxiv.org/abs/cond-mat/9511114v1

Physics

Condensed Matter

28 pages, RevTeX 3.0, 5 Postscript pictures

Scientific paper

The low energy photoemission spectra in quantum antiferromagnets are studied by using several approximation-free calculations and rigorous theorems. The important and measurable property found is that the hole eigenstates with momenta differing by the antiferromagnetic wavevector $Q$ are equivalent and degenerate in energy. However the corresponding eigenstates differs by the presence or the absence of a well defined quasiparticle corresponding to a singular -zero energy- magnon, carrying spin one and momentum $Q$. This difference between the two eigenstates affects dramatically the spectral weight as a function of the scattered momentum, since a sharp effect at the surface of the magnetic Brillouin zone is predicted, in apparent agreement with recent experimental data.

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