Effects of a weak disorder on two coupled Hubbard chains

Details Effects of a weak disorder on two coupled Hubbard chains Effects of a weak disorder on two coupled Hubbard chains

1995-07-11

arxiv.org/abs/cond-mat/9507029v1

Phys. Rev. B 53 p. R10453 (1996)

Physics

Condensed Matter

12 pages, ReVTeX ,paper submitted to PRL

Scientific paper

10.1103/PhysRevB.53.R10453

We consider the effect of weak nonmagnetic disorder on two chains of interacting fermions (with and without spins) coupled by interchain hopping. For the spinless case, interchain hopping increases localization for repulsive interactions but {\it stabilizes} the s-wave superconducting phase for attractive interactions. For the case with spin, the d-wave phase arising from purely repulsive interactions in the clean system is destroyed by an infinitesimal disorder while for attractive interactions, the s-wave superconductivity is more resistant to disorder than in the one-chain case.

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