| skos:altLabel | - Sommerfeld
- free electrons
- Sommerfeld model
- electron gas
- free electron gas
- free-electron gas
- free electron
- Conduction electron
- Drude–Sommerfeld model
- Sommerfeld free-electron-type model
- Sommerfeld theory
- Sommerfeld's free-electron theory
- charge carriers in a metal
- conduction electron
- electron gas confined in a metal
- electron gases
- electron theory of metals
- electron-lattice potential
- free electron gases in metals
- free electron model
- free electron model of an electron gas
- free-electron model
- free-electron theory
- free-electron-type states
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