This book, âQuasiparticles (Ideas and principles of solid state quantum physics)â, was written by two outstanding specialists in the solid state quantum theory. The book is meant for a broad circle of readers. It contains no complicated mathematical formulas, nor derivations of them. The authors base the presentation on analogies, assuming their readers to possess certain degree of intuition in the field of physics. The book tells how atomic particles move inside solids, what is meant by the term âthermal motionâ, and how the characteristics of motion of atomic particles are revealed in the macroscopic properties of solids.