Theoretical understanding of the quasiparticle dispersion in bilayer high-Tc superconductors
Jian-Xin Li, T. Zhou, Z. D. Wang
Abstract
The renormalization of quasiparticle (QP) dispersion in bilayer high-Tc 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 (π,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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