Physics – Condensed Matter – Materials Science
Scientific paper
2007-04-11
Phys. Rev. B 75, 195335 (2007)
Physics
Condensed Matter
Materials Science
19 pages, 4 figures, to be published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.75.195335
We present a combined experimental and computational study of the (110) cross-sectional surface of Mn $\delta$-doped GaAs samples. We focus our study on three different selected Mn defect configurations not previously studied in details, namely surface interstitial Mn, isolated and in pairs, and substitutional Mn atoms on cationic sites (Mn$_{\rm Ga}$) in the first subsurface layer. The sensitivity of the STM images to the specific local environment allows to distinguish between Mn interstitials with nearest neighbor As atoms (Int$_{\rm As}$) rather than Ga atoms (Int$_{\rm Ga}$), and to identify the fingerprint of peculiar satellite features around subsurface substitutional Mn. The simulated STM maps for Int$_{\rm As}$, both isolated and in pairs, and Mn$_{\rm Ga}$ in the first subsurface layer are consistent with some experimental images hitherto not fully characterized.
Duan Xueying
Furlanetto D.
Modesti Silvio
Peressi Maria
Stroppa Alessandro
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