Transverse spectral functions and Dzyaloshinskii-Moriya interactions in XXZ spin chains

Details Transverse spectral functions and Dzyaloshinskii-Moriya interactions in XXZ spin chains Transverse spectral functions and Dzyaloshinskii-Moriya interactions in XXZ spin chains

2011-06-27

arxiv.org/abs/1106.5541v2

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.84.174420

Recently much progress has been made in applying field theory methods, first developed to study X-ray edge singularities, to interacting one dimensional systems in order to include band curvature effects and study edge singularities at arbitrary momentum. Finding experimental confirmations of this theory remains an open challenge. Here we point out that spin chains with uniform Dzyaloshinskii-Moriya (DM) interactions provide an opportunity to test these theories since these interactions may be exactly eliminated by a gauge transformation which shifts the momentum. However, this requires an extension of these X-ray edge methods to the transverse spectral function of the xxz spin chain in a magnetic field, which we provide.

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