Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-11-22
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 4 figures
Scientific paper
The spatial distribution of the local density of states (LDOS) at Mn acceptors near the (110) surface of p-doped InAs is investigated by Scanning Tunneling Microscopy (STM). The shapes of the acceptor contrasts for different dopant depths under the surface are analyzed. Acceptors located within the first ten subsurface layers of the semiconductor show a lower symmetry than expected from theoretical predictions of the bulk acceptor wave function. They exhibit a (001) mirror asymmetry. The degree of asymmetry depends on the acceptor atoms' depths. The measured contrasts for acceptors buried below the 10th subsurface layer closely match the theoretically derived shape. Two effects are able to explain the symmetry reduction: the strain field of the surface relaxation and the tip-induced electric field.
Loth Sebastian
Ulbrich Rainer G.
Wenderoth Martin
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