Spinons vs. psinons

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Hi,

I've recently read an introductory review of Bethe ansatz for antiferromagnetic spin-1/2 Heisenberg chains : cond-mat: 9809163. I understand that the elementary excitations above the ground state in absence of magnetic field are spinons.

The article claims that when a finite magnetic field is applied the excitations can be described as psinons, which are 1/2 spin particles (like spinons) and they also represented as holes among the Bethe-quantum numbers (like spinons). However I couldn't really tell what is the exact difference between these two particles.

Can somebody explain this?
 

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atyy
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jtbell
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Also, a Google search for "psinon" turns up nothing remotely related to condensed-matter physics, at least on the first three pages of hits.
 

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