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?
Is it http://arxiv.org/abs/cond-mat/9809163? I couldn't find where they use the word "psinon", although they use "spinon".
Also, a Google search for "psinon" turns up nothing remotely related to condensed-matter physics, at least on the first three pages of hits.
Sorry guys, wrong link. It is actually in the third part: http://arxiv.org/abs/cond-mat/0008018 Here are some more articles, conserning this topic: http://prb.aps.org/abstract/PRB/v66/i5/e054405 http://prb.aps.org/abstract/PRB/v62/i22/p14871_1