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Free Electron Fermi Gas (Kittel Ch. 6) - SMU Physics

free Electron Fermi Gas ( kittel Ch. 6). Role of Electrons in Solids Electrons are responsible for binding of crystals -- they are the glue that hold the nuclei together Types of binding (see next slide). Van der Waals - electronic polarizability Ionic - Electron transfer Covalent - Electron bonds Electrons are responsible for important properties: Electrical conductivity in metals (But why are some solids insulators?). Magnetism Optical properties .. Characteristic types of binding Closed-Shell Binding Ionic Binding Van der Waals Covalent Binding Metallic Binding Starting Point for Understanding Electrons in Solids Nature of a metal: Electrons can become free of the nuclei and move between nuclei since we observe electrical conductivity Electron Gas Simplest possible model for a metal - electrons are completely free of the nuclei - nuclei are replaced by a smooth background -- Electrons in a box.

Free Electron Fermi Gas (Kittel Ch. 6) Role of Electrons in Solids ... Density of states • Key point - exactly the same as for vibration waves • We need the number of states per unit energy to find the total energy and the thermal properties of the electron gas.

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