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Pair correlations and structure factor of the J1-J2 square lattice Ising model in an external field

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  • Guerrero, Alejandra I.
  • Stariolo, Daniel A.

Abstract

We compute the structure factor of the J1-J2 Ising model in an external field on the square lattice within the Cluster Variation Method. We use a four point plaquette approximation, which is the minimal one able to capture phases with broken orientational order in real space, like the recently reported Ising-nematic phase in the model. The analysis of different local maxima in the structure factor allows us to track the different phases and phase transitions against temperature and external field. Although the nematic susceptibility is not directly related to the structure factor, we show that because of the close relationship between the nematic order parameter and the structure factor, the latter shows unambiguous signatures of the presence of a nematic phase, in agreement with results from direct minimization of a variational free energy. The disorder variety of the model is identified and the possibility that the CVM four point approximation be exact on the disorder variety is discussed.

Suggested Citation

  • Guerrero, Alejandra I. & Stariolo, Daniel A., 2017. "Pair correlations and structure factor of the J1-J2 square lattice Ising model in an external field," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 466(C), pages 596-606.
    • Handle: RePEc:eee:phsmap:v:466:y:2017:i:c:p:596-606
    DOI: 10.1016/j.physa.2016.09.052
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    References listed on IDEAS

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    1. S. A. Kivelson & E. Fradkin & V. J. Emery, 1998. "Electronic liquid-crystal phases of a doped Mott insulator," Nature, Nature, vol. 393(6685), pages 550-553, June.
    2. Sanchez, J.M., 1982. "Pair correlations in the cluster variation approximation," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 111(1), pages 200-216.
    3. Sanchez, J.M. & Ducastelle, F. & Gratias, D., 1984. "Generalized cluster description of multicomponent systems," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 128(1), pages 334-350.
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    Cited by:

    1. Rossato, Leonardo C. & Zimmer, F.M. & Morais, C.V. & Schmidt, M., 2023. "The Ising bilayer honeycomb lattice: A cluster mean-field study," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 621(C).

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