Calculate the eigenenergy splitting present at the


Exercise -

The eigenstates of electrons in a periodic potential are described by Bloch waves. Each Bloch factor has to obey the respective differential equation

1319_figure.png

Please prove -

(a) The Kramer's degeneracy (valid for same band index σ) εσ(k) = εσ(-k ), and

(b) The relation εσ'(k→ + Kh→) = εσ(k) and the property for the set of Bloch waves

1954_figure1.png

(c) Calculate the eigenenergy splitting present at the Brillouin zone boundaries via the Bloch wave solutions valid in a case of a weak potential modulation felt by the electrons.

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Advanced Statistics: Calculate the eigenenergy splitting present at the
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