Confinement of spinons in the CPM-1 model

Andrey V. Chubukov, Oleg A. Starykh

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


We use the 1/M expansion for the CPM-1 model to study the long-distance behavior of the staggered spin susceptibility in the commensurate, two-dimensional quantum antiferromagnet at finite temperature. At M= this model possesses deconfined spin-1/2 bosonic spinons (Schwinger bosons), and the susceptibility has a branch cut along the imaginary k axis. We show that in all three scaling regimes at finite T, the interaction between spinons and gauge-field fluctuations leads to divergent 1/M corrections near the branch cut. We identify the most divergent corrections to the susceptibility at each order in 1/M and explicitly show that the full static staggered susceptibility has a number of simple poles rather than a branch cut. We compare our results with the 1/N expansion for the O(N) sigma model.

Original languageEnglish (US)
Pages (from-to)440-450
Number of pages11
JournalPhysical Review B
Issue number1
StatePublished - 1995


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