Abstract
The Bethe ansatz leads to Yang-Yang integral equations. The particle-hole structure of the zero-temperature excitations is generalized to finite temperatures, which leads to the definition of soliton- and phonon-quasiparticles. The solitons approximately follow the Fermi-Dirac statistics and have a chemical potential with an unusual temperature dependence, because the number of solitons is not constant.
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Mertens, F.G., Hader, M. Toda solitons as Fermi-quasiparticles. Z. Physik B - Condensed Matter 69, 121–127 (1987). https://doi.org/10.1007/BF01560620
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DOI: https://doi.org/10.1007/BF01560620