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Introduction to Solid-State Theory

Introduction to Solid-State Theory is a textbook for graduate students of physics and materials science. It also provides the theoretical background needed by physicists doing research in pure solid-state physics and its applications to electrical engineering. The fundamentals of solid-state theory are based on a description by delocalized and localized states and - within the concept of delocalized states - by elementary excitations. The development of solid-state theory within the last ten years has shown that by a systematic introduction of these concepts, large parts of the theory can be described in a unified way. At the same time, this form of description gives a "pictorial" formulation of many elementary processes in solids, which facilitates their understanding.

Each volume element of size (2n)3/Vt contains two states which, inside the Fermi
sphere at T=0, are occupied by electrons with opposite spin. of the Fermi sphere (
Fermi energy) : kF = (3n2n)l>3, E?=^Qn2nyi\ (2.9) 2.1.3 Excited States The ...