Condensed matter physics refers to the branch of physics which studies the microscopic and macroscopic physical properties of matter. It particularly deals with the solid and liquid phases that originate from electromagnetic forces among atoms. The Bose–Einstein condensate originating in ultracold atomic systems, superconducting phase revealed through certain materials at low temperatures, and the antiferromagnetic and ferromagnetic phases of spins on crystal lattices of atoms are some of the exotic condensed phases. The magnetic, elastic, optical, thermal and electrical properties of liquid and solid substances are also studied in condensed-matter physics. Its study comprises the principles of electromagnetism, quantum mechanics and statistical mechanics. There are various applications of condensed matter physics in developing devices such as solid state laser, liquid crystal display and optical fiber. This book includes some of the vital pieces of work being conducted across the world on condensed matter physics. It aims to serve as a resource guide for students and experts alike and contribute to the growth of the discipline.