Pokrovsky-Talapov model at finite temperature: a renormalization-group analysis

A. Lazarides, O. Tieleman, C. de Morais Smith

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We calculate the finite-temperature shift of the critical wave vector Qc of the Pokrovsky-Talapov model using a renormalization-group analysis. Separating the Hamiltonian into a part that is renormalized and one that is not, we obtain the flow equations for the stiffness and an arbitrary potential. We then specialize to the case of a cosine potential, and compare our results to well-known results for the sine-Gordon model, to which our model reduces in the limit of vanishing driving wave vector Q=0. Our results may be applied to describe the commensurate-incommensurate phase transition in several physical systems and allow for a more realistic comparison with experiments, which are always carried out at a finite temperature.
Original languageUndefined/Unknown
Pages (from-to)245418/1-245418/7
Number of pages7
JournalPhysical review. B, Condensed matter and materials physics
Issue number24
Publication statusPublished - 2009

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