Bi- and tetracritical phase diagrams in three dimensions

A. Aharony, O. Entin-Wohlman, A. Kudlis

Research output: Working paper/PreprintPreprint

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Abstract

The critical behavior of many physical systems involves two competing n1− and n2−component order-parameters, S1 and S2, respectively, with n = n1 +n2. Varying an external control parameter g, one encounters ordering of S1 below a critical (second-order) line for g < 0 and of S2 below another critical line for g > 0. These two ordered phases are separated by a first-order line, which meets the above critical lines at a bicritical point, or by an intermediate (mixed) phase, bounded by two critical lines, which meet the above critical lines at a tetracritical point. For n = 1 + 2 = 3, the critical behavior around the (bi- or tetra-) multicritical point either belongs to the universality class of a non-rotationally invariant (cubic or biconical) fixed point, or it has a fluctuation driven first-order transition. These asymptotic behaviors arise only very close to the transitions. We present accurate renormalization-group flow trajectories yielding the effective crossover exponents near multicriticality.
Original languageEnglish
StatePublished - 2 Mar 2022

Keywords

  • cond-mat.stat-mech
  • hep-th

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