title: Spin orthogonality catastrophe in two-dimensional antiferromagnets and superconductors.
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.
authors: Department of Physics, Yale University, New Haven, CT 06520-8120, USA.
authors: S
authors: S
authors: Sachdev
authors: M
authors: M
authors: Troyer
authors: M
authors: M
authors: Vojta