منابع مشابه
Surface Diffusion including Adatoms
The aim of this paper is to study continuum models for surface diffusion taking into account free adatoms on the surface, which is of particular importance in the (self-assembled) growth of nanostructures. The extended model yields a coupled system of parabolic differential equations for the surface morphology and the adatom density, involving a cross-diffusion structure. We investigate two dif...
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The low-temperature surface diffusion of isolated Cr adatoms on Au(111) has been determined using nonperturbing x rays. Changes in the x-ray magnetic circular dichroism spectral line shape together with Monte Carlo calculations demonstrate that adatom nucleation proceeds via quantum tunneling diffusion rather than over-barrier hopping for temperatures <40K. The jump rates are shown to be as muc...
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We use ab initio methods to calculate the properties of adatom defects on a graphite surface. By applying a full spin-polarized description to the system we demonstrate that these defects have a magnetic moment of about 0.5micro(B) and also calculate its role in diffusion over the surface. The magnetic nature of these intrinsic carbon defects suggests that it is important to understand their ro...
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In this paper, surface and piezoelectric effects on the vibration behavior of nanowires (NWs) are investigated by using a Timoshenko beam model. The electric field equations and the governing equations of motion for the piezoelectric NWs are derived with the consideration of surface effects. By the exact solution of the governing equations, an expression for the natural frequencies of NWs with ...
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The microscopic diffusional dynamics of Na adatoms on a Cu~001! surface is modeled by the classical deterministic motion of a particle from a two-dimensional periodic potential previously fitted to the experiment. Depending on the energy of the particle, a series of chaotic transitions take place determining transport properties of the system. Two different regimes of diffusion, anomalous and n...
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ژورنال
عنوان ژورنال: Communications in Mathematical Sciences
سال: 2006
ISSN: 1539-6746,1945-0796
DOI: 10.4310/cms.2006.v4.n1.a1