Faculty Publications

Electronic Structure Changes of Si (001) - (2×1) From Subsurface Mn Observed by STM

Document Type

Article

Journal/Book/Conference Title

Physical Review B - Condensed Matter and Materials Physics

Volume

75

Issue

20

Abstract

The deposition of Mn atoms onto the Si (001) - (2×1) reconstructed surface has been studied using scanning tunneling microscopy (STM) and first-principles electronic structure calculations. Room-temperature deposition of 0.1 ML (monolayer) of Mn gives rise to a disordered surface structure. After in situ annealing between 300 and 700°C, most of the Mn is incorporated into three-dimensional manganese silicide islands, and Si dimer rows reappear in the STM images on most of the substrate surface. At the same time, rowlike structures are visible in the atomic-scale STM images. A comparison with calculated STM images provides evidence that Mn atoms are incorporated into the row structures in subsurface interstitial sites, which are the lowest-energy position for Mn on Si(001). The subsurface Mn alters the height and local density of states of the Si dimer atoms, causing them to appear 0.6 higher than a neighboring Si dimer with no Mn below. This height difference that allows the detection the subsurface Mn results from a subtle interplay of geometrical and electronic effects. © 2007 The American Physical Society.

Department

Department of Physics

Original Publication Date

5-18-2007

DOI of published version

10.1103/PhysRevB.75.205326

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