Weak Signals Amplification Through Controlled Bifurcations in Quasi-Two-Dimensional Electron Gas
Received 23 August 2018; accepted 26 October 2018
2018, Vol. 14, no. 4, pp. 453-472
Author(s): Maglevanny I. I., Smolar V. A., Karyakina T. I.
In this paper, we consider the activation processes in a nonlinear bistable system based on
a lateral (quasi-two-dimensional) superlattice and study the dynamics of such a system externally
driven by a harmonic force. The internal control parameters are the longitudinal applied
electric field and the sample temperature. The spontaneous transverse electric field is considered
as an order parameter. The forced violations of the order parameter are considered as a response
of a system to periodic driving. We investigate the cooperative effects of self-organization and
harmonic forcing from the viewpoint of catastrophe theory. Complex nonlinear behaviors including
the energetic activation barrier or, more generally, a form of threshold leading to forced
bifurcations of dc components of output response accompanied by enhancement of its odd harmonic
components were discovered in limited narrow ranges of the control parameters space
through numerical simulations. We observed the resonant behaviors of spectral amplification
coefficient which is maximized when control parameters are tuned near the critical values of
synergetic potential.
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