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INVESTIGATIONS ON THE DYNAMICS OF A METAL-FERROELECTRIC SEMICONDUCTOR HETEROSTRUCTURE

B. Mereu1,* , M. Alexe1, M. Diestelhorst2, C. P. Cristescu3, C. Stan3

Affiliation

  1. Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120, Halle, Germany
  2. Fachbereich Physik, Halle-Wittenberg University, Friedmann-Bach-Platz 6, D- 06108 Halle, Germany
  3. Department of Physics, Politehnica University of Bucharest, RO-060042, Romania

Abstract

A series RLC electric circuit with the metal-ferroelectric-semiconductor (MFS) hetero structure playing the role of nonlinear capacity shows various nonlinear dynamics such as period doubling and Ruelle-Takens scenarios of evolution to chaos. In this paper we present preliminary experimental investigations and theoretical analysis on the dynamics of this structure. We focus only on a period-doubling bifurcation evolution to chaos induced by the change in the amplitude of a sinusoidal driving. A theoretical model of MFS structure as nonlinear element of an electrical circuit justifies a model of two coupled nonlinear Duffing oscillators. The model takes into consideration the presence of two types of nonlinearities. The first, originating in the switching of the ferroelectric domains is treated in the framework of Landau phase transition theory and the second, originating in the asymmetry of the semiconductor surface potential as function of the charge density, is considered in the classical theory of MOS structures. The dynamics of the theoretical model are in reasonable agreement with the experimental results..

Keywords

MFS hetero-structures, Nonlinear dynamics, Chaos.

Submitted at: Aug. 18, 2004
Accepted at: March 23, 2005

Citation

B. Mereu, M. Alexe, M. Diestelhorst, C. P. Cristescu, C. Stan, INVESTIGATIONS ON THE DYNAMICS OF A METAL-FERROELECTRIC SEMICONDUCTOR HETEROSTRUCTURE, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 2, pp. 691-695 (2005)