We theoretically study current self-oscillations and spatiotemporal current patterns in quantum-well negative effective mass(NEM)p^+pp^+ diodes by considering scattering contributions from impurity,acoustic phonons and optic phonos,It is indicated that both the applied bias and the doping concentration strongly influence the patterns and self-oscillating frequencies.The NEM p+pp^+ diode presented here may be used as an electrically tunable terahertz source.
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