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- W4384919611 abstract "We introduce a Brownian $p$-state clock model in two dimensions and investigate the nature of phase transitions numerically. As a nonequilibrium extension of the equilibrium lattice model, the Brownian $p$-state clock model allows spins to diffuse randomly in the two-dimensional space of area $L^2$ under periodic boundary conditions. We find three distinct phases for $p>4$: a disordered paramagnetic phase, a quasi-long-range-ordered critical phase, and an ordered ferromagnetic phase. In the intermediate critical phase, the magnetization order parameter follows a power law scaling $m sim L^{-tilde{beta}}$, where the finite-size scaling exponent $tilde{beta}$ varies continuously. These critical behaviors are reminiscent of the double Berezinskii-Kosterlitz-Thouless~(BKT) transition picture of the equilibrium system. At the transition to the disordered phase, the exponent takes the universal value $tildebeta = 1/8$ which coincides with that of the equilibrium system. This result indicates that the BKT transition driven by the unbinding of topological excitations is robust against the particle diffusion. On the contrary, the exponent at the symmetry-breaking transition to the ordered phase deviates from the universal value $tilde{beta} = 2/p^2$ of the equilibrium system. The deviation is attributed to a nonequilibrium effect from the particle diffusion." @default.
- W4384919611 created "2023-07-21" @default.
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- W4384919611 date "2023-07-19" @default.
- W4384919611 modified "2023-09-24" @default.
- W4384919611 title "Nonequilibrium phase transitions in Brownian $p$-state clock model" @default.
- W4384919611 doi "https://doi.org/10.48550/arxiv.2307.09945" @default.
- W4384919611 hasPublicationYear "2023" @default.
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