Electronic structure of superconducting gallium-doped germanium from ab-initio calculations

Details Electronic structure of superconducting gallium-doped germanium from ab-initio calculations Electronic structure of superconducting gallium-doped germanium from ab-initio calculations

2009-07-02

arxiv.org/abs/0907.0433v1

Physics

Condensed Matter

Materials Science

Submitted to physica status solidi - Rapid Research Letters

Scientific paper

Using ab-initio calculations, we study the electronic structure of gallium-doped germanium, which was found recently to be a superconductor, with a critical temperature of 0.5 Kelvins, and a particularly low density of Cooper pairs. The calculations of the electronic properties reveal that no sign of an impurity band is observed, and that the Fermi level lies in the valence band of Germanium. Moreover, the calculation of the phonon frequencies shows that a new mode associated to the Ga atom is appearing, around 175$ cm-1.

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