Fate of spinons in spontaneously dimerized spin-ladders
- 1 April 2000
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 61 (13) , 8871-8877
- https://doi.org/10.1103/physrevb.61.8871
Abstract
We study a weakly coupled, frustrated two-leg spin-1/2 Heisenberg ladder. For vanishing coupling between the chains, elementary excitations are deconfined, gapless spin-1/2 objects called spinons. We investigate the fate of spinons for the case of a weak interchain interaction. We show that despite a drastic change in ground state, which becomes spontaneously dimerized, spinons survive as elementary excitations but acquire a spectral gap. We furthermore determine the exact dynamical structure factor for several values of momentum transfer.Keywords
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