CRITICAL CONCENTRATION FOR THE METAL-NON METAL TRANSITION IN n-TYPE GERMANIUM AND SILICON

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Abstract
The metal-non metal transition in n-type Ge and Si is considered by means of a model that has features in common with recent work on electron-hole droplets. The critical concentration is determined by comparing the energy of the metallic phase with the energy of an electron bound to a donor ion. Agreement with experiments is satisfactory and chemical shifts are reproduced. Previous estimates of the critical concentration are reviewed

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