Abstract

The far infrared photoconductivity of Si doped GaAs has been studied using an optically pumped FIR laser working in the 10-150 cm range. At temperatures between H and 10 K in magnetic fields up to 12 T an almost complete set of transitions from the shallow (Si) donor groundstate to the excited hydrogenic levels (n = 2,3,4) is observed. The obtained field dependence of the energy levels is in good agreement with theoretical calculations.

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