Superconducting fluctuations in the Luther-Emery liquid
Edmond Orignac, Didier Poilblanc
DOI 10.1103/PhysRevB.68.052504 · Physical Review B
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Abstract
The single-particle superconducting Green’s functions of a Luther-Emery liquid is computed by bosonization techniques. Using a formulation introduced by Poilblanc and Scalapino [Phys. Rev. B 66, 052513 (2002)], an asymptotic expression of the superconducting gap is deduced in the long wavelength and small frequency limit. Due to superconducting phase fluctuations, the gap exhibits as a function of size L a (1/L)1/2Kρ power-law decay as well as an interesting singularity at the spectral gap energy. Similarities and differences with the two-leg t−J ladder are outlined.
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