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Stimulated diffusion of an adsorbed dimer.

O M Braun¹, R Ferrando, G E Tommei

¹Institute of Physics, National Academy of Sciences of Ukraine, 03650 Kiev, Ukraine. obraun@iop.kiev.ua

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|December 20, 2003

Summary

The study investigates how a dimer, two atoms linked by a spring, moves in a periodic potential under external forces. Driving forces can significantly increase the dimer

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Area of Science:

Condensed matter physics
Statistical mechanics

Background:

Understanding particle transport in periodic potentials is crucial for nanoscale devices.
The behavior of coupled systems (dimers) differs from single particles.

Purpose of the Study:

To investigate the mobility and diffusivity of a dimer in a periodic substrate potential.
To analyze the influence of combined direct current (dc) and alternating current (ac) external forces on dimer dynamics.
To determine conditions for enhanced dimer diffusivity.

Main Methods:

Theoretical modeling of a dimer system.
Analysis of particle dynamics under external driving forces.
Simulation of transport properties in periodic potentials.

Main Results:

The dimer exhibits complex mobility patterns influenced by dc and ac driving forces.
Strong enhancement of dimer diffusivity is observed under specific driving conditions.
The interplay between the substrate potential and external forces dictates the transport regime.

Conclusions:

External driving forces, particularly combined dc and ac fields, can significantly enhance dimer diffusivity.
The findings have implications for controlling and optimizing nanoscale transport phenomena.
This study provides insights into the non-equilibrium dynamics of coupled Brownian particles.

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