Regensburg 2013 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 35: Brownian Motion and Transport

DY 35.7: Vortrag

Freitag, 15. März 2013, 11:00–11:15, H48

Mass loading induced dephasing in nanomechanical resonators — •Juan Atalaya — Institut für Theoretische Festkörperphysik, Karlsruher Institut für Technologie, Karlsruher, Deutschland.

I study dephasing of an underdamped nanomechanical resonator subject to random mass loading of small particles. I propose a frequency noise model to describe dephasing due to attachment and detachment of particles at random points and particle diffusion along the resonator. This situation is commonly encountered in current mass measurement experiments using nanoelectromechanical (NEM) resonators. I discuss the conditions which can lead to inhomogeneous broadening and fine structure in the vibrational modes absorption spectra. I show that the spectra of the higher-order cumulants of the (complex) vibrational mode amplitude are sensitive to the parameters characterizing the frequency noise process. Hence, measurement of these cumulants can provide information not only about the mass but also about other parameters of the adsorbed particles (diffusion coefficient, attachment and detachment rates).