Solitonic-exchange mechanism of surface diffusion

Article

关键词: SUBSTRATE;    KINKS;   

DOI  :  10.1103/PhysRevB.54.313

来源: SCIE

【 摘 要 】

We study surface diffusion in the framework of a generalized Frenkel-Kontorova model with a nonconvex transverse degree of freedom. The model describes a lattice of atoms with a given concentration interacting by Morse-type forces, the lattice being subjected to a two-dimensional substrate potential which is periodic in one direction and nonconvex (Morse) in the transverse direction. The results are used to describe the complicated exchange-mediated diffusion mechanism recently observed in molecular dynamics simulations [J. E. Black and Zeng-Ju Tian, Phys. Rev. Lett. 71, 2445 (1993)].

【 授权许可】

Free