The subject of the talk relates to a class of nonlinear oscillators called zero-dispersion (ZD) oscillators: they combine strongly resonant properties in some range of energy (quite similar to that by the harmonic oscillator) with weaker resonant properties beyond this range (characteristic for conventional nonlinear oscillators). If the oscillator is perturbed, e.g. by a periodic signal or noise or their combinations, then energy varies, so that there are transitions between the ranges - and these transitions result in unique phenomena absent either in the harmonic oscillator or in conventional nonlinear oscillators.

For the manifestation of ZD phenomena to be strong, a damping should be pretty low while the latter seemed to be hardly attainable in most of real systems. It was only recently realized that some types of micro/nano-electromechanical systems (MEMS/NEMS) can combine both the ZD property and an extremely low damping. The first experiment was recently performed in the US: a noise-induced narrowing of the fluctuation spectra was observed in the trampoline resonator. Our analysis shows that this and other ZD phenomena may have a much stronger performance in some other types of resonators. Apart from the scientific value, studies of these phenomena promise to lay a basis of a conceptually new use of MEMS/NEMS for sensing instrumentation.

About the Speaker

Graduated from Kiev State University (Ukraine) in 1982

Degrees: PhD, Dr.Sci.

Affiliation: Institute of Semiconductor Physics, Kiev, Ukraine

Position: Leading Scientific Researcher

Past collaborations and visiting positions: Lancaster University (UK), Pisa University (Italy), International Centre for Theoretical Physics (Trieste, Italy), Max-Planck Institute (Dresden, Germany), University of Florida (USA), Hong Kong University (Hong Kong), Rio Claro University (Brazil), and others.

Current active collaborations: Warwick University, Lancaster University, Hong Kong University

Main research fields:

Fluctuations in dynamical systems

1. Nonlinear dynamics

2. Applications of the above fields to various physical systems, in particular to: SQUIDs, superlattices and micro/nano-electromechanical systems (MEMS/NEMS)