Classical aspects of quantum spin chains

L. F. Lemmens, K. Kopinga, W.J.M. De Jonge

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)
86 Downloads (Pure)


We suggest a new variational approach for quantum spin chains, based on the stochastic behavior of the quantization axes, which describes a chain in terms of a classical and a quantum contribution to the free energy. For an easy-plane ferromagnetic chain with the external field in the plane it reveals that the nonlinear excitations are predominantly described by the classical degrees of freedom. Hence it offers a fundamental basis for the description of the elementary excitations of such systems in terms of classical solitons and quantum spin waves, as suggested by various experiments.

Original languageEnglish
Pages (from-to)5-8
Number of pages4
JournalPhysical Review Letters
Issue number1
Publication statusPublished - 1 Jan 1989


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