Physics – Condensed Matter – Superconductivity
Scientific paper
2007-07-20
Phys. Rev. B 78, 020508(R) (2008)
Physics
Condensed Matter
Superconductivity
revised text with new figures, to be published, Phys Rev B
Scientific paper
10.1103/PhysRevB.78.020508
We illustrate the importance of many-body effects in the Fourier transformed local density of states (FT-LDOS) of d-wave superconductors from a model of electrons coupled to an Einstein mode with energy Omega_0. For bias energies significantly larger than Omega_0 the quasiparticles have short lifetimes due to this coupling, and the FT-LDOS is featureless if the electron-impurity scattering is treated within the Born approximation. In this regime it is important to include boson exchange for the electron-impurity scattering which provides a `step down' in energy for the electrons and allows for long lifetimes. This many-body effect produces qualitatively different results, namely the presence of peaks in the FT-LDOS which are mirrors of the quasiparticle interference peaks which occur at bias energies smaller than ~ Omega_0. The experimental observation of these quasiparticle mirages would be an important step forward in elucidating the role of many-body effects in FT-LDOS measurements.
Klironomos Alexios D.
Norman Michael R.
Paul Indranil
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