The Structure of GaSb Digitally Doped with Mn

Details The Structure of GaSb Digitally Doped with Mn The Structure of GaSb Digitally Doped with Mn

2004-12-22

arxiv.org/abs/cond-mat/0412629v2

Physical Review B, 71, 193307 (2005).

Physics

Condensed Matter

Materials Science

10 pages, 5 figures, submitted to PRB Brief Report, revised version

Scientific paper

10.1103/PhysRevB.71.193307

Cross sectional scanning tunneling microscopy (XSTM) and density functional theory have been used to characterize the structure of GaSb digitally doped with Mn. The Mn dopants are found in both isolated substitutional form as well as in large clusters of zinc-blende MnSb commensurate with the surrounding GaSb matrix. Theoretical calculations predict that these two forms of Mn in the digitally doped layers will have a very different appearance in XSTM images. Substitutional Mn enhances the local density of states near the surface, thus appearing higher in a filled-state image. In contrast, MnSb clusters induce substantial structural relaxation at the {110} surface, and therefore appear as localized depressed regions with negligible perturbation of the surrounding GaSb.

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