Correlation lengths in quantum spin ladders

Olav F. Syljuåsen, Sudip Chakravarty, Martin Greven

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Analytic expressions for the temperature dependences of the correlation length are given for antiferromagnetic spin- 12 Heisenberg ladders using a finite-size nonlinear σ model approach. These calculations rely on identifying three successive crossover regimes as a function of temperature. In each of these regimes, precise and controlled approximations are formulated. The analytical results are found to be in excellent agreement with Monte Carlo simulations for the Heisenberg Hamiltonian.

Original languageEnglish (US)
Pages (from-to)4115-4118
Number of pages4
JournalPhysical review letters
Issue number21
StatePublished - 1997

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