1. Physics of Nanodevices, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands, Surfaces and Thin Films, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands, Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece, Department of Chemistry, University of Crete, 71409 Heraklion, Greece, and Kamerlingh Onnes Laboratory, Leiden University, P.O....