Effect of bilayer coupling on tunneling conductance of double-layer high-T-c cuprates

Physical effects of bilayer coupling on the tunneling spectroscopy of high-T-c cuprates are investigated. The bilayer coupling separates the bonding and antibonding bands and leads to a splitting of the coherence peaks in the tunneling differential conductance. However, the coherence peak of the bonding band is strongly suppressed and broadened by the particle-hole asymmetry in the density of states and finite quasiparticle lifetime, and is difficult to resolve by experiments. This gives a qualitative account why the bilayer splitting of the coherence peaks was not clearly observed in tunneling measurements of double-layer high-T-c oxides.Physics, Condensed MatterSCI(E)0ARTICLE21null6