Infrared probe of the insulator-to-metal transition in Ga1-xMnxAs and Ga1-xBexAs

Article

关键词: MAGNETIC SEMICONDUCTORS;    FERROMAGNETISM;    TEMPERATURE;    SPECTRA;    BAND;   

DOI  :  10.1103/PhysRevB.84.081203

来源: SCIE

【 摘 要 】

We report infrared studies of the insulator-to-metal transition (IMT) in GaAs doped with either magnetic (Mn) or nonmagnetic acceptors (Be). We observe a resonance with a natural assignment to impurity states in the insulating regime of Ga1-xMnxAs, which persists across the IMT to the highest doping (16%). Beyond the IMT boundary, behavior combining insulating and metallic trends also persists to the highest Mn doping. Be-doped samples, however, display conventional metallicity just above the critical IMT concentration, with features indicative of transport within the host valence band.

【 授权许可】

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