Chaotic dynamics of electric-field domains in periodically driven superlattices

Details Chaotic dynamics of electric-field domains in periodically driven superlattices Chaotic dynamics of electric-field domains in periodically driven superlattices

1995-10-22

arxiv.org/abs/cond-mat/9510126v1

Phys. Rev. B 53 (1996) 10008

Physics

Condensed Matter

9 pages, LaTex, RevTex. 12 uuencoded figures (1.8M) should be requested by e-mail from the author

Scientific paper

10.1103/PhysRevB.53.10008

Self-sustained time-dependent current oscillations under dc voltage bias have been observed in recent experiments on n-doped semiconductor superlattices with sequential resonant tunneling. The current oscillations are caused by the motion and recycling of the domain wall separating low- and high-electric- field regions of the superlattice, as the analysis of a discrete drift model shows and experimental evidence supports. Numerical simulation shows that different nonlinear dynamical regimes of the domain wall appear when an external microwave signal is superimposed on the dc bias and its driving frequency and driving amplitude vary. On the frequency - amplitude parameter plane, there are regions of entrainment and quasiperiodicity forming Arnol'd tongues. Chaos is demonstrated to appear at the boundaries of the tongues and in the regions where they overlap. Coexistence of up to four electric-field domains randomly nucleated in space is detected under ac+dc driving.

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