Theoretical Calculation for the Dip Feature in TunnellingExperiment on Bi2212

We generalize a model, which was presented by Norman Phys. Rev. Lett. 79 (1997) 3506, to calculate the Bi₂Sr₂CaCu₂O_8+δ (Bi2212) single-electron tunnelling conductance. In our calculation result, the dip feature appears which has been widely observed in tunnelling experiments. It is found that this dip feature in tunnelling experiment and the dip/hump feature in angle-resolved photoemission experiment have a common physics. Moreover, it is shown from our numerical calculation method that if the spectral function A(K,ω) is known, the tunnelling conductance can be obtained.