Evolution of the spin gap upon doping a 2-leg ladder | |
Article | |
关键词: T-J LADDERS; SUPERCONDUCTING CORRELATIONS; EXCITATION SPECTRUM; PHOTOEMISSION; DENSITY; HOLE; | |
DOI : 10.1103/PhysRevB.62.R14633 | |
来源: SCIE |
【 摘 要 】
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 quasiparticles. previous experimental results on the superconducting two-leg ladder Sr14-xCaxCu24O41 are discussed.
【 授权许可】
Free