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By means of quasiparticle-energy calculations in the G0W0 approach, we showfor the prototypical insulator/semiconductor system NaCl/Ge(001) thatpolarization effects at the interfaces noticeably affect the excitationspectrum of molecules adsorbed on the surface of the NaCl films. The magnitudeof the effect can be controlled by varying the thickness of the film, offeringnew opportunities for tuning electronic excitations in e.g. molecularelectronics or quantum transport. Polarization effects are visible even for theexcitation spectrum of the NaCl films themselves, which has importantimplications for the interpretation of surface science experiments for thecharacterization of insulator surfaces.

Controlling polarization at insulating surfaces: quasiparticle calculations for molecules adsorbed on insulator films