Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 54: Electronic structure II

O 54.5: Talk

Wednesday, March 24, 2010, 16:00–16:15, H33

Electronic structures of thin NaCl (100) films grown on a Ag (111) surface — •Sarah-Charlotta Heidorn, André Sabellek Sabellek, and Karina Morgenstern — Institut für Festkörperphysik, Abteilung ATMOS, Hannover, Deutschland

In nanoelectronics, ultrathin epitaxical insulating films are needed to separate conducting material in electronic devices of the future. NaCl is a prototype wide bandgap insulator and its electronic interactions with metals are of great interest. We present a quantitative low-temperature scanning tunnelling spectroscopy study of the interface state of nanoscale NaCl(100)-islands on Ag(111) and of the surface state on Ag(111) close to NaCl(100)-islands. The interface state energy of NaCl(100) on Ag(111) depends on island-size and -geometry. Additionally, indications for size quantization on islands are observed. The surface state on the Ag(111) shifts close to the polar edges of NaCl(100)-islands. Details of the spatially resolved dI/dV-spectra will be discussed in the presentation.