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An electrostatic field, which is applied to a gated high-temperaturesuperconducting (HTSC) film, is believed to affect the film similar to chargedoping. Analyzing the pairing in terms of a t-J model, we show that a couplingto electric dipoles and phonons at the interface of film and dielectric gatelocalizes the injected charge and leads to a superconductor-insulatortransition. This results in a dramatic modification of the doping dependentphase diagram close to and above the optimal doping which is expected to shedlight on recent electric field-effect experiments with HTSC cuprates.Comment: 6 pages, 6 figures, to appear in Physical Review

Electrostatic interface tuning in correlated superconducting heterostructures