Spectrum dynamics of negative-effective-mass oscillators under terahertz radiation

We report on a theoretical investigation of power spectrum dynamics in nega tive-effective-mass (NEM) p(+)pp(+) oscillators under the influence of tera hertz (THz) electromagnetic radiation. Possible types of transport states ( periodic or chaotic) and transitions between them are examined with the int ensity and frequency of the radiation as controlling parameters. When the d riving frequency is fixed to the self-oscillating frequency times the inver se Golden ratio, the resulting power spectrum pattern displays a very compl ex mosaic scenario with a self-similar emergence of high-order mixing frequ encies. (C) 2001 American Institute of Physics.