Chaotic dynamics of electric-field domains in periodically driven superlattices
| Autor: | M. J. García, Oleg Bulashenko, Luis L. Bonilla |
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| Přispěvatelé: | Universitat de Barcelona |
| Předmět: |
Physics
Condensed matter physics Plane (geometry) Superlattice Condensed Matter (cond-mat) Tunneling (Physics) FOS: Physical sciences Condensed Matter Nonlinear Sciences - Chaotic Dynamics Quasiperiodicity Amplitude Domain wall (magnetism) Semiconductors Fluid dynamics Electric field Dinàmica de fluids Efecte túnel Chaotic Dynamics (nlin.CD) Quantum tunnelling DC bias |
| Zdroj: | Scopus-Elsevier Dipòsit Digital de la UB Universidad de Barcelona Recercat. Dipósit de la Recerca de Catalunya instname |
| Popis: | 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. Comment: 9 pages, LaTex, RevTex. 12 uuencoded figures (1.8M) should be requested by e-mail from the author |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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