Nonlinear Phenomena in Complex Systems, 2008, Vol.11, No.3, pp.344-351

NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
An Interdisciplinary Journal

2008, Vol.11, No.3, pp.344-351

Bound-Spinon Excitations in the Ferromagnetic Ising Spin Chain in a Skew Magnetic Field.
S. B. Rutkevich, A. N. Yashin, A. I. Kopeliovich, and A. V. Yanovsky

We study the excitation energy spectrum in the S=1/2 ferromagnetic Ising spin chain in a magnetic field h having both h_x and h_z components. According to Wu and McCoy scenario of the weak confinement, the fermionic spinon excitations (domain walls) being free at h_z=0, are coupled into bosonic bound states at arbitrary small h_z >0. We calculate perturbatively in h_z the energy spectrum E_n(P) of such excitations for .
Key words: Ising spin chain, confinement, bound-spinon

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