I would like to express my gratitude to all those who supported me during the road leading to the creation of this thesis.First and foremost, I would like to thank my supervisor, Carlos A. Iglesias for inviting me to collaboration, teaching about doing research and giving me the freedom to pursue and implement new ideas my own way.Secondly, Mercedes Garijo for admitting me the GSI group and allowing to realise my dream of living and doing research in Spain.Aside of Mercedes, I would like to thank the remaining members of PhD Committee that agreed to review my thesis and particípate in the thesis defence, namely: