Effects of longer-range interactions on unconventional superconductivity

S. Raghu, E. Berg, A. V. Chubukov, S. A. Kivelson

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55 Scopus citations


We analyze the effect of the nonvanishing range of electron-electron repulsion on the mechanism of unconventional superconductivity. We present asymptotically exact weak-coupling results for dilute electrons in the continuum and for the 2D extended Hubbard model, as well as density-matrix renormalization group results for the two-leg extended Hubbard model at intermediate couplings, and approximate results for the case of realistically screened Coulomb interactions. We show that T c is generally suppressed in some pairing channels as longer range interactions increase in strength, but superconductivity is not destroyed. Our results confirm that electron-electron interaction can lead to unconventional superconductivity under physically realistic circumstances.

Original languageEnglish (US)
Article number024516
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number2
StatePublished - Jan 9 2012
Externally publishedYes


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