We consider adsorption of random copolymer chains onto an interface within the model of Garel et al. [Europhys. Lett. 8, 9 (1989)]. By using the replica method the adsorption of the copolymer at the interface is mapped onto the problem of finding the ground state of a quantum mechanical Hamiltonian. To study this ground state we introduce a novel variational principle for the Green's function, which generalizes the well-known Rayleigh-Ritz method of quantum mechanics to nonstationary states. Minimization with an appropriate trial Green's function enables us to find the phase diagram for the localization-delocalization transition for an ideal random copolymer at the interface.
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Stepanow et al. (1998) studied this question.
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