Weak-coupling calculation of the gap structure of doped n-leg Hubbard ladders

1996/09/16 by N. Bulut, Bulut, N., D. J. Scalapino +1
Physics and Astronomy · #Condensed Matter (cond-mat) #FOS: Physical sciences #cond-mat

paper · pdf · doi:10.48550/arxiv.cond-mat/9609136

9 pages and 11 ps figures, uses revtex

arxiv created 1996/09/16 · arxiv updated 2009/11/30

Abstract

In weak coupling, the spin gap in doped, even, n-leg periodic Hubbard ladders reflects the energy to break a pair into separate quasiparticles. Here we investigate the structure of the gap within a spin-fluctuation exchange approximation. We also calculate the amplitude for removing a singlet pair from two lattice sites separated by a distance (l_x,l_y), which describes the internal structure of a pair.

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