Evolutionary approach for finding the atomic structure of steps on stable crystal surfaces

Details Evolutionary approach for finding the atomic structure of steps on stable crystal surfaces Evolutionary approach for finding the atomic structure of steps on stable crystal surfaces

2007-02-27

arxiv.org/abs/cond-mat/0702622v1

Physical Review B 75, 195415 (2007) (7 pages)

Physics

Condensed Matter

Materials Science

some low resolution figures due to arxiv limits

Scientific paper

10.1103/PhysRevB.75.195415

The problem addressed here can be concisely formulated as follows: given a stable surface orientation with a known reconstruction and given a direction in the plane of this surface, find the atomic structure of the steps oriented along that direction. We report a robust and generally applicable variable-number genetic algorithm for step structure determination and exemplify it by determining the structure of monatomic steps on Si(114)-$2\times 1$. We show how the location of the step edge with respect to the terrace reconstructions, the step width (number of atoms), and the positions of the atoms in the step region can all be simultaneously determined.

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