is a reference and textbook for graduate students of physics and material sciences. While covering the traditional topics of solid-state textbooks, it also takes up new developments in theoretical concepts and materials that are connected with such breakthroughs as the quantum-Hall effects, the high-Tc superconductors, and the low-dimensional systems realized in solids. Thus, besides providing the fundamental concepts to describe the physics of the electrons and ions comprising the solid, including their interactions, the book makes clear links to the experimental results and gives the reader an excellent insight into current research fields. A compilation of problems makes the book especially valuable to both students and teachers.