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Logarithmic coarsening in the Coulomb glass
Preeti Bhandari1,2, Vikas Malik3, Sanjay Puri1
1School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India.
Abstract:
We present numerical results from a comprehensive Monte Carlo study in two dimensions (d=2) of coarsening kinetics in the Coulomb glass (CG) model at half-filling. The CG model is characterized by spin-spin interactions which are long-range Coulombic and antiferromagnetic. For the nonequilibrium properties studied by us (spatial correlation functions and domain growth laws), we find that domain growth in the CG is analogous to that in the nearest-neighbor random-field Ising model. The domain length scale L(t) shows a crossover from a regime of "power-law growth with a disorder-dependent exponent" [L(t)∼t^{1/z[over ¯]}] to a regime of "logarithmic growth with a universal exponent" [L(t)∼(lnt)^{1/ψ}].
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