Theoretical understanding of the quasiparticle dispersion in bilayer high-$T_{c}$ superconductors

Details Theoretical understanding of the quasiparticle dispersion in bilayer high-$T_{c}$ superconductors Theoretical understanding of the quasiparticle dispersion in bilayer high-$T_{c}$ superconductors

2005-01-15

arxiv.org/abs/cond-mat/0501356v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.72.094515

The renormalization of quasiparticle (QP) dispersion in bilayer high-$T_{c}$ cuprates is investigated theoretically by examining respectively the interactions of the QP with spin fluctuations (SF) and phonons. It is illustrated that both interactions are able to give rise to a kink in the dispersion around the antinodes (near $(\pi,0)$). However, remarkable differences between the two cases are found for the peak/dip/hump structure in the lineshape, the QP weight, and the interlayer coupling effect on the kink, which are suggested to serve as a discriminance to single out the dominant interaction in the superconducting state. A comparison to recent photoemission experiments shows clearly that the coupling to the spin resonance is dominant for the QP around antinodes in bilayer systems.

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