Article

# Vibrational Instability due to Coherent Tunneling of Electrons

EPL (Europhysics Letters) (Impact Factor: 2.26). 04/2001; DOI: 10.1209/epl/i2002-00611-3

Source: arXiv

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**ABSTRACT:**In this paper, we report a theoretical analysis of a nanoelectromechanical shuttle based on a multiscale model that combines microscopic electronic structure data with macroscopic dynamics. The microscopic part utilizes a (static) density functional description to obtain the energy levels and orbitals of the shuttling particle together with the forces acting on the particle. The macroscopic part combines stochastic charge dynamics that incorporates the microscopically evaluated tunnelling rates with a Newtonian dynamics. We have applied the multiscale model to describe the shuttling of a single copper atom between two gold-like jellium electrodes. We find that energy spectrum and particle surface interaction greatly influence shuttling dynamics; in the specific example that we studied the shuttling is found to involve only charge states Q = 0 and Q = +e. The system is found to exhibit two quasi-stable shuttling modes, a fundamental one and an excited one with a larger amplitude of mechanical motion, with random transitions between them.New Journal of Physics 03/2007; 9(3):51. · 4.06 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**The aim of this paper is to emphasize the role of coupling between electronic and mechanical degrees of freedom taking place on a nanometer length scale. Such coupling affects significantly the electrical properties of nanocomposite materials which are usually heteroconducting and heteroelastic by their nature. As examples of nanoelectromechanics in normal and superconducting composites a self-assembled single electronic device exhibiting a dynamical instability leading to shuttling of electrical charge by a movable Coulomb dot is discussed along with an example of shuttling of Cooper pairs by a movable Single Cooper Pair Box.Physica Scripta 07/2006; 2002(T102):13. · 1.03 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**We present a microscopic study of single-electron tunneling in nanomechanical double-barrier tunneling junctions formed using a vibrating scanning nanoprobe and a metallic nanoparticle connected to a metallic substrate through a molecular bridge. We analyze the motion of single electrons on and off the nanoparticle through the tunneling current, the displacement current, and the charging-induced electrostatic force on the vibrating nanoprobe. We demonstrate the mechanical single-electron turnstile effect by applying the theory to a gold nanoparticle connected to the gold substrate through an alkane dithiol molecular bridge and probed by a vibrating platinum tip.Physical Review B 07/2004; 70(15). · 3.66 Impact Factor

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