Spectral function of superconducting cuprates near optimal doping

Andrey V. Chubukov, Dirk K. Morr

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

We argue that the unusual peak-dip-hump features observed in photoemission experiments on Bi2212 at T ≪ Tc can be explained by the interaction of the fermionic quasiparticles with overdamped spin fluctuations. We show that the strong spin-fermion interaction combined with the feedback effect on the spin damping due to superconductivity yields the fermionic spectral function A(kF, ω) which simultaneously displays a quasiparticle peak at ω = Δ and a broad maximum (hump) at ω ≫ Δ. In between the two regimes, the spectral function has a dip at Δ ∼ 2Δ. We argue that our theory also explains the tunneling data.

Original languageEnglish (US)
Pages (from-to)4716-4719
Number of pages4
JournalPhysical review letters
Volume81
Issue number21
DOIs
StatePublished - 1998

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