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Nearly-free electron model

The nearly-free electron model treats a weak periodic potential by degenerate perturbation theory. At a Bragg crossing, a Fourier coefficient

V_{n}

couples the two degenerate plane waves and opens an energy gap of width

2∣ V_{n} ∣

.

Table of contents 59 1
- Nearly-free electron dispersion near a one-dimensional band gap Nearly-free electron model 27

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