Spin Orthogonality Catastrophe in Two-Dimensional Antiferromagnets and Superconductors
Subir Sachdev, Matthias Troyer, Matthias Vojta
DOI 10.1103/PhysRevLett.86.2617 · Physical Review Letters
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Abstract
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.
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