Abstract
We have studied the magnetic-field-induced narrowing of far-infrared (FIR) magneto optical absorption line for is-2p +1 transition of hydrogenic shallow donors in n-GaAs, of which line-width is dominated by the concentration broadening. The concentration range of donor is 1.5 × 10 15 cm −3 to 6.0 × 10 16cm −3, which extends over the concentration for occurrence of metal-insulator transition (Molt transition), i.e., 1.6 × 10 16cm −3. The linewidth narrowing due to magnetic field is considered to arise from the strong shrinkage of 2p +1 state.
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