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We review the use of Legendre transforms in the formulation of electrostatic energies in condensed matter. We show how to render standard functionals expressed in terms of the electrostatic potential, φ, convex – at the cost of expressing them in terms of the vector field D. This leads to great simplification in the formulation of numerical minimisation of electrostatic energies coupled to other physical degrees of freedom. We also demonstrate the equivalence of recent functionals for dielectrics derived using field theory methods to classical formulations in terms of the electric polarisation.

Electrostatics in Electrolytes Expressed in an Exact Formalism Reminiscent of the Poisson–Boltzmann Picture