Doping and temperature dependence of electron spectrum and quasiparticle dispersion in doped bilayer cuprates

Details Doping and temperature dependence of electron spectrum and quasiparticle dispersion in doped bilayer cuprates Doping and temperature dependence of electron spectrum and quasiparticle dispersion in doped bilayer cuprates

2006-10-17

arxiv.org/abs/cond-mat/0610459v2

Phys. Rev. B 75, 134513 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 4 figures, updated references, added figures and discussions, accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.75.054513

Within the t-t'-J model, the electron spectrum and quasiparticle dispersion in doped bilayer cuprates in the normal state are discussed by considering the bilayer interaction. It is shown that the bilayer interaction splits the electron spectrum of doped bilayer cuprates into the bonding and antibonding components around the $(\pi,0)$ point. The differentiation between the bonding and antibonding components is essential, which leads to two main flat bands around the $(\pi,0)$ point below the Fermi energy. In analogy to the doped single layer cuprates, the lowest energy states in doped bilayer cuprates are located at the $(\pi/2,\pi/2)$ point. Our results also show that the striking behavior of the electronic structure in doped bilayer cuprates is intriguingly related to the bilayer interaction together with strong coupling between the electron quasiparticles and collective magnetic excitations.

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