Acknowledgment

Most of the material presented in this review is the result of previous collaborations with A. Bergara, A. Eiguren, X. Lopez-Gonzalez, J. Sisti, J. Zakrzewski. We would like to thank them all. This work was supported by the Universidad del Pais Vasco/Euskal Herriko Unibertsitatea (Grant No. UFI 11/55), the Ministerio de Economia y Competitividad (Grant No. FIS2012-36673-C03-03), the Basque Government (Grant No. IT-472-10), the Helmholtz Gemeinschaft Deutscher-Young Investigators Group (Grant No. VH-NG-717, Functional Nanoscale Structure and Probe Simulation Laboratory) and the Impuls und Vernetzungsfonds der Helmholtz-Gemeinschaft Postdoc Programme.

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