Finite temperature phase transition in the two-dimensional Coulomb glass at low disorders

Preeti Bhandari, Vikas Malik

Published 2017-08-03Version 1

We investigate the lattice Coulomb glass model in two dimensions via Monte Carlo simulations at finite temperature for zero and small disorders. The system is annealed from $T=1$ to $T=0.01$. We find an existence of charge-ordered phase (COP) at low disorders and small temperatures. The probability distribution of the staggered magnetization shows a two peak structure at the critical temperature for zero and low disorders thus the phase transition from fluid to COP as a function of temperature is second order. We find no evidence of a spin glass phase between fluid and the COP. Further we have used finite size scaling analysis to calculate the critical exponents. The critical exponents at $W=0.0$ are different from small disorder ($W=0.075$ and $0.15$) which indicates that the disorder is relevant.