Resonant magnetic mode in superconducting 2-leg ladders
arXiv:cond-mat/0402011 · doi:10.1103/PhysRevB.69.220406
Abstract
The spin dynamics of a doped 2-leg spin ladder is investigated by numerical techniques. We show that a hole pair-magnon boundstate evolves at finite hole doping into a sharp magnetic excitation below the two-particle continuum. This is supported by a field theory argument based on a SO(6)-symmetric ladder. Similarities and differences with the resonant mode of the high-T$_c$ cuprates are discussed.
5 pages, 5 figures