Theoretical understanding of the quasiparticle dispersion in bilayer high-$T_c$ superconductors

Abstract

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.

4 pages, 4 figures

References in corpus (1)

• Two resonant magnetic modes in an overdoped high-${\mathbf{T}}_{\mathbf{c}}$ superconductor

Cited by in corpus (5)

• The effect of collective spin-1 excitations on electronic spectra in high-Tc superconductors
• Spin dynamics in electron-doped pnictide superconductors
• The origins of macroscopic quantum coherence in high temperature super conductivity
• Theoretical investigation of the four-layered self-doped high-T${}_c$ superconductors: evidence of pair tunneling effect
• Effect of spin excitations on the property of quasiparticles in electron-doped cuprates