Spin orthogonality catastrophe in two-dimensional antiferromagnets and superconductors.
We compute the spectral function of a spin S hole injected into a two-dimensional antiferromagnet or superconductor in the vicinity of a magnetic quantum critical point. We show that, near Van Hove singularities, the problem maps onto that of a static vacancy carrying excess spin S. The hole creation operator is characterized by a new boundary anomalous dimension and a vanishing quasiparticle residue at the critical point. We discuss possible relevance to photoemission spectra of cuprate superconductors near the antinodal points.
Sachdev
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S
Department of Physics, Yale University, New Haven, CT 06520-8120, USA.
Troyer
M
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Vojta
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