The world of semiconductor research is continuously expanding our knowledge of the physics governing phenomena at micro and nano scales, driving the development of new technologies and rapidly enhancing the quality of our everyday life. The huge amount of scientific papers published today in this field of research confirms the great interest of the scientific community in semiconductor science and its future applications. However, this enormous growth of available scientific information sometimes makes the familiar channels of communication considerably less effective, because of the difficulties for experts in a given field to keep up with the current literature. "Advances in Semiconductor Physics" Series has been conceived mainly to improve this situation. This monograph presents a collection of selected contributions reporting some of the most stimulating and challenging results obtained by recent researches in the field of semiconductor physics. About the same number of theoretical, experimental and simulative studies have been included in this book, driven by the basic idea that all these different types of investigations are equally important in increasing our understanding of the physics of semiconductors.