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Evolution of the Spin Gap Upon Doping a 2-Leg Ladder

D. Poilblanc·O. Chiappa·J. Riera·S. R. White·D. J. Scalapino
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Abstract

The evolution of the spin gap of a 2-leg ladder upon doping depends upon the nature of the lowest triplet excitations in a ladder with two holes. Here we study this evolution using various numerical techniques for a t-t'-J ladder as the next-near-neighbor hopping t' is varied. We find that depending on the value of t', the spin gap can evolve continuously or discontinuously and the lowest triplet state can correspond to a magnon, a bound magnon-hole-pair, or two separate quasi-particles. Previous experimental results on the superconducting two-leg ladder Sr12Ca2Cu24O41 are discussed.

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D. Poilblanc, O. Chiappa, J. Riera, S. R. White, D. J. Scalapino. 2000-05-24. Evolution of the Spin Gap Upon Doping a 2-Leg Ladder. https://doi.org/10.1103/physrevb.62.r14633

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