We present an efficient method for simulating Coulomb systems confined bymetal electrodes. The approach relies on Green functions techniques to obtainthe electrostatic potential for an infinite periodically replicated system.This avoids the use of image charges or an explicit calculation of the inducedsurface charge, both of which dramatically slows down the simulations. Todemonstrate the utility of the new method we use it to obtain the ionic densityprofiles and the differential capacitances, which are of great practical andheoretical interest, for a lattice model of an ionic liquid.
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