Theory of SIS tunnelling in the cuprates
Department of Physics, Loughborough University -
Loughborough LE11 3TU, UK
Accepted: 22 February 2002
We show that the single-particle polaron Green's function describes SIS tunnelling in cuprates, including the absence of Ohm's law at high voltages, the dip/hump features in the first derivative of the current, a substantial incoherent spectral weight beyond quasiparticle peaks and the unusual shape of the peaks. The theory allows us to determine the characteristic phonon frequency, coupling constant, normal and superconducting gap, and the impurity scattering rate.
PACS: 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 74.20.-z – Theories and models of superconducting state / 74.25.Jb – Electronic structure
© EDP Sciences, 2002