Quasiparticle mirages in the tunneling spectra of d-wave superconductors
I. Paul, A. D. Klironomos, M. R. Norman
DOI 10.1103/PhysRevB.78.020508 · Physical Review B
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Abstract
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 Ω0. For bias energies significantly larger than Ω0, 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 ∼Ω0. 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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