Abstract
We present the microscopic view for the excitations around the 1/3 plateau state of the Ising-like zigzag chain. We analyze the low-energy excitations around the plateau with the degenerating perturbation theory from the Ising limit, combined with the Bethe-form wave function. We then find that the domain-wall particles carrying and its bound state of describe well the low-energy excitations around the 1/3 plateau state. The formation of the bound state of the domain walls clearly provides the microscopic mechanism of the cusp singularities and the even-odd behavior in the magnetization curve.
- Received 11 June 2003
DOI:https://doi.org/10.1103/PhysRevB.68.224422
©2003 American Physical Society