Journal article

Nonthermal Antiferromagnetic Order and Nonequilibrium Criticality in the Hubbard Model

  • Tsuji, Naoto Department of Physics, University of Fribourg, Switzerland
  • Eckstein, Martin Max Planck Research Department for Structural Dynamics, University of Hamburg, Germany
  • Werner, Philipp Department of Physics, University of Fribourg, Switzerland
Published in:
  • Physical Review Letters. - 2013, vol. 110, no. 13, p. 136404
English We study dynamical phase transitions from antiferromagnetic to paramagnetic states driven by an interaction quench in the fermionic Hubbard model using the nonequilibrium dynamical mean-field theory. We identify two dynamical transition points where the relaxation behavior qualitatively changes: one corresponds to the thermal phase transition at which the order parameter decays critically slowly in a power law ∝t-1/2, and the other is connected to the existence of nonthermal antiferromagnetic order in systems with effective temperature above the thermal critical temperature. The frequency of the amplitude mode extrapolates to zero as one approaches the nonthermal (quasi)critical point, and thermalization is significantly delayed by the trapping in the nonthermal state. A slow relaxation of the nonthermal order is followed by a faster thermalization process.
Faculté des sciences et de médecine
Département de Physique
  • English
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