Applied Surface Science, Vol.212, 705-710, 2003
Dynamics of c(4 x 2) phase-transition in Si(100) surfaces
The Si(1 0 0) surfaces exhibit an order-disorder phase-transition at the critical temperature T-c from the 2 x 1 structure of apparently symmetric dimers to the c(4 x 2) structure of buckled dimers. We study the flip-flop dynamics of buckled dimers in the vicinity of T-c, using the kinetic Monte Carlo simulation based on the Ising spin model Hamiltonian. Phasons, thermally excited phase defects on alternately buckled dimer rows, play an essential role on both the phase-transition and the flip-flop dynamics of buckled dimers. (C) 2003 Elsevier Science B.V. All rights reserved.