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Straight Step Edge Formation on an InAs(001) Vicinal Surface by the Transition of Surface Reconstruction

Step structures of InAs (001) vicinal surfaces tilted by 1° towards the [11̄0] direction were investigated using scanning tunneling microscopy. A transition from an As-stabilized ( 2×4) to an In-stabilized ( 4×2) reconstruction caused a change in the step structure of the vicinal surfaces from ragged to straight along the [110] direction with the incorporation of step bunching. The straight shape of the step structure seems to be caused by desorption of arsenic atoms along the [110] direction.