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Fast collective oscillations and clustering phenomena in an antiferromagnetic mean-field model

Author

Listed:
  • Vesperini, Arthur
  • Franzosi, Roberto
  • Ruffo, Stefano
  • Trombettoni, Andrea
  • Leoncini, Xavier

Abstract

We study the out-of-equilibrium properties of the antiferromagnetic Hamiltonian Mean-Field model at low energy. In this regime, the Hamiltonian dynamics exhibits the presence of a long-lived metastable state where the rotators are gathered in a bicluster. This state is not predicted by equilibrium statistical mechanics in the microcanonical ensemble. Performing a low kinetic energy approximation, we derive the explicit expression of the magnetization vector as a function of time. We find that the latter displays coherent oscillations, and we show numerically that the probability distribution for its phase is bimodal or quadrimodal. We then look at the individual rotator dynamics as a motion in an external time-dependent potential, given by the magnetization. This dynamics exhibits two distinct time scales, with the fast one associated to the oscillations of the global magnetization vector. Performing an average over the fast oscillations, we derive an expression for the effective force acting on the individual rotator. This force is always bimodal, and determines a low frequency oscillation of the rotators. Our approach leads to a self-consistent theory linking the time-dependence of the magnetization to the motion of the rotators, providing a heuristic explanation for the formation of the bicluster.

Suggested Citation

  • Vesperini, Arthur & Franzosi, Roberto & Ruffo, Stefano & Trombettoni, Andrea & Leoncini, Xavier, 2021. "Fast collective oscillations and clustering phenomena in an antiferromagnetic mean-field model," Chaos, Solitons & Fractals, Elsevier, vol. 153(P2).
  • Handle: RePEc:eee:chsofr:v:153:y:2021:i:p2:s0960077921008419
    DOI: 10.1016/j.chaos.2021.111487
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    References listed on IDEAS

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    1. Campa, Alessandro & Giansanti, Andrea & Mukamel, David & Ruffo, Stefano, 2006. "Dynamics and thermodynamics of rotators interacting with both long- and short-range couplings," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 365(1), pages 120-127.
    2. Yamaguchi, Yoshiyuki Y. & Barré, Julien & Bouchet, Freddy & Dauxois, Thierry & Ruffo, Stefano, 2004. "Stability criteria of the Vlasov equation and quasi-stationary states of the HMF model," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 337(1), pages 36-66.
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