Sangwoong Park

University of Suwon, Whasung-Gun, Gyeonggi Province, South Korea

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Publications (2)5.64 Total impact

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    ABSTRACT: We present a numerical study on an interacting monomer-dimer model with nearest neighbor repulsion on a square lattice, which possesses two symmetric absorbing states. The model is observed to exhibit two nearby continuous transitions: the $Z_2$ symmetry-breaking order-disorder transition and the absorbing transition with directed percolation criticality. We find that the symmetry-breaking transition shows a non-Ising critical behavior, and that the absorbing phase becomes critical, in the sense that the critical decay of the dimer density observed at the absorbing transition persists even within the absorbing phase. Our findings call for further studies on the microscopic models and corresponding continuum description belonging to the generalized voter universality class.
    Journal of Statistical Mechanics Theory and Experiment 03/2011; 6(06). · 1.87 Impact Factor
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    Sangwoong Park, Bongsoo Kim, Sung Jong Lee
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    ABSTRACT: We find a breakdown of the critical dynamic scaling in the coarsening dynamics of an antiferromagnetic {\em XY} model on the kagome lattice when the system is quenched from disordered states into the Kosterlitz-Thouless ({\em KT}) phases at low temperatures. There exist multiple growing length scales: the length scales of the average separation between fractional vortices are found to be {\em not} proportional to the length scales of the quasi-ordered domains. They are instead related through a nontrivial power-law relation. The length scale of the quasi-ordered domains (as determined from optimal collapse of the correlation functions for the order parameter $\exp[3 i \theta (r)]$) does not follow a simple power law growth but exhibits an anomalous growth with time-dependent effective growth exponent. The breakdown of the critical dynamic scaling is accompanied by unusual relaxation dynamics in the decay of fractional ($3\theta$) vortices, where the decay of the vortex numbers is characterized by an exponential function of logarithmic powers in time.
    Physical review. B, Condensed matter 01/2009; · 3.77 Impact Factor

Publication Stats

1 Citation
5.64 Total Impact Points

Institutions

  • 2009–2011
    • University of Suwon
      • Department of Physics
      Whasung-Gun, Gyeonggi Province, South Korea