Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 19: Electronic structure II

O 19.5: Vortrag

Dienstag, 28. März 2006, 12:15–12:30, WIL A317

STS study of Fe monomers and multimers on InAs(110) surfaces — •Tomohiro Matsui, Christian Meyer, Lilli Sacharow, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg

The local density of states on and around single Fe atoms (monomers) and Fe multimers (dimers, trimers and tetramers both perpendicular and parallel to the As rows of the substrate) on n-InAs(110) surfaces were studied by scanning tunneling spectroscopy at T ∼ 6 K.

Different states are observed for a monomer as peaks in the tunneling spectrum: The most prominent peak is spatially localized mainly on the Fe atom, while the other states are spread to the As or In atoms next to the Fe. Their shapes are strongly anisotropic reflecting the asymmetry of the substrate lattice. The peak structure changes by manipulating the atom laterally suggesting different bonding configurations of the Fe to the substrate.

On multimers, the main peak related to the Fe is found at lower energies. The peak shifts in energy from one side to the other side of the multimer. However, this behavior is observed only for the perpendicular case presumably because of the asymmetry of the substrate lattice. For the parallel tetramers, on the other hand, three symmetric states are observed. The first is extended over the whole tetramer, while the others are localized on the end or the middle atoms of the tetramer.