On the energy spectrum of a spin lattice formed by a finite number of coupled spin-1/2 XY chains
V O Cheranovskii; E V Ezerskaya; T O Kuznetsova; V O Cheranovskii; Kharkov National University, 61077, Kharkov, Ukraine; E V Ezerskaya; Kharkov National University, 61077, Kharkov, Ukraine; T O Kuznetsova; Kharkov National University, 61077, Kharkov, Ukraine
Журнал:
Journal of Physics: Condensed Matter
Дата:
2002-09-02
Аннотация:
We studied the energy spectrum of a spin lattice formed by m XY spin-1/2 chains with Ising inter-chain coupling. For strong ferromagnetic coupling we found that the lowest-energy states for non-zero numbers of inverted spins on each XY chain have n-magnon bound character if n ml − 1, where l 2, 3,.... For a spin tube formed by three XY chains with strong ferromagnetic inter-chain coupling, the lowest-energy states are described by the XXZ spin-1/2 chain model with antiferromagnetic coupling.
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