Condensed matter physics is the field of physics that deals with the macroscopic and microscopic physical properties of matter. This book discusses topics such as the field electron emission theory; organic-inorganic hybrid proton exchange membrane electrolytes for medium temperature non-humidified H2/O2 fuel cells; electronic band structure calculations based on empirical psuedopotential formalism; rate-dependent hysteresis in piezoelectric actuators and an itinerant-electron metamagnetic system with two-band Eigenvalue spectrum.