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Recent experiments have shown that steps on Si(113) surfaces self-organizeinto bunches due to a competition between long-range repulsive and short-rangeattractive interactions. Using empirical and tight-binding interatomicpotentials, we investigate the physical origin of the short-range attraction,and report the formation and interaction energies of steps. We find that theshort-range attraction between steps is due to the annihilation of forcemonopoles at their edges as they combine to form bunches. Our results for thestrengths of the attractive interactions are consistent with the valuesdetermined from experimental studies on kinetics of faceting.Comment: 4 pages, 3 figures, to appear in Phys. Rev B, Rapid Communication

Atomic-scale perspective on the origin of attractive step interactions on Si(113)