Superconducting fluctuations in the Luther-Emery liquid

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 v. 66, art. 052513 (2002)], an asymptotic expression of the superconducting gap is deduced in the long...

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Veröffentlicht in:Physical review. B, Condensed matter Condensed matter, 2003-08, Vol.68 (5), Article 052504
Hauptverfasser: Orignac, Edmond, Poilblanc, Didier
Format: Artikel
Sprache:eng
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Zusammenfassung: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 v. 66, art. 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)^{1/2K_\\rho} power-law decay as well as an interesting singularity at the spectral gap energy. Similarities and differences with the 2-leg t-J ladder are outlined.
ISSN:0163-1829
1098-0121
1095-3795
1550-235X
DOI:10.1103/PhysRevB.68.052504