Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

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Electron effective mass enhancement in Ga(AsBi) alloys probed by cyclotron resonance spectroscopy
Pettinari, G.; Drachenko, O.; Lewis, R. B.; Tiedje, T.;
The effect of Bi incorporation on the conduction band structure of Ga(AsBi) alloys is revealed by a direct estimation of the electron effective mass via cyclotron resonance absorption spectroscopy at THz frequencies in pulsed magnetic fields up to 65 T. A strong enhancement in the electron effective mass with increasing Bi content is reported, with a value of mass ∼40% higher than that in GaAs for ∼1.7% of Bi. This experimental evidence unambiguously indicates a Bi-induced perturbation of the host conduction band states and calls for a deep revision of the theoretical models describing dilute bismides currently proposed in the literature, the majority of which neglect or exclude that the incorporation of a small percentage of Bi may affect the conduction band states of the host material.

Publ.-Id: 24901 - Permalink