Excitons in QED3 and spin response in a phase-fluctuating d-wave superconductor

Abstract

We study the particle-hole exciton mode in the QED3 theory of a phase-fluctuating d-wave superconductor in ladder approximation. We derive a Schroedinger-like equation for the exciton bound state and determine the conditions for its existence. We find the dispersion of this mode below the particle-hole continuum and compare our results with the resonance observed in neutron scattering measurements in cuprates.

8 pages, 3 .eps fugures, RevTeX4; v2: Brief literature review added, references updated and a few typos corrected. Published version in PRB

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Cited by in corpus (3)

• Dynamical fermion mass generation and exciton spectra in graphene
• Criterion for dynamical chiral symmetry breaking
• Solutions of Bethe-Salpter equations in QED3