Spectral effects of dispersive mode coupling in driven mesoscopic systems

TL;DR

This paper investigates how dispersive mode coupling affects the spectral properties of driven mesoscopic systems, developing a path-integral approach to analyze the spectral broadening and shape changes caused by nonlinear interactions and weak resonant driving.

Contribution

It introduces a novel path-integral method to analyze spectral effects of dispersive mode coupling in driven mesoscopic systems, revealing how coupling strength and decay rates influence spectral features.

Findings

Mode coupling causes identifiable spectral broadening.

Spectral shape depends on coupling strength and decay rates.

Intra- and inter-mode nonlinearities produce qualitatively different spectra.

Abstract

Nanomechanical and other mesoscopic vibrational systems typically have several nonlinearly coupled modes with different frequencies and with long lifetime. We consider the power spectrum of one of these modes. Thermal fluctuations of the modes nonlinearly coupled to it lead to fluctuations of the mode frequency and thus to the broadening of its spectrum. However, the coupling-induced broadening is partly masked by the spectral broadening due to the mode decay. We show that the mode coupling can be identified and characterized using the change of the spectrum by weak resonant driving. We develop a path-integral method of averaging over the non-Gaussian frequency fluctuations from nonresonant (dispersive) mode coupling. The shape of the driving-induced power spectrum depends on the interrelation between the coupling strength and the decay rates of the modes involved. The characteristic features of the spectrum are analyzed in the limiting cases. We also find the power spectrum of a driven mode where the mode has internal nonlinearity. Unexpectedly, the power spectra induced by the intra- and inter-mode nonlinearities are qualitatively different. The analytical results are in excellent agreement with the numerical simulations.