Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-07-28
Phys. Rev. B 60 (1999) 1175
Physics
Condensed Matter
Strongly Correlated Electrons
15 pages, 6 figures, added references; final version to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.60.1175
The zero-temperature dynamical spin-spin correlation functions are calculated for the spin-1/2 two-leg Heisenberg ladder in a magnetic field above the lower critical field Hc1. The dynamical structure factors are calculated which exhibit both massless and massive excitations. These modes appear in different sectors characterized by the parity in the rung direction and by the momentum in the direction of the chains. The structure factors have power-law singularities at the lower edges of their support. The results are also applicable to spin-1 Heisenberg chain. The implications are briefly discussed for various correlation functions and the pi-resonance in the SO(5) symmetric ladder model.
Furusaki Akira
Zhang Shou-Cheng
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