Regensburg 2007 – scientific programme

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O: Fachverband Oberflächenphysik

O 12: Nanostructures at Surfaces II (Wires, Tubes)

O 12.8: Talk

Monday, March 26, 2007, 16:00–16:15, H36

Electronic properties of self-organized bi-atomic Fe chains on Ir(001) — •Matthias Menzel, André Kubetzka, Kirsten von Bergmann, Matthias Bode, and Roland Wiesendanger — Institut für Angewandte Physik, Universität Hamburg,

The clean Ir(001) surface layer rearranges in a quasi-hexagonal structure, thereby forming a (5×1) reconstruction. As previously shown by Hammer et al. [1], this Ir(001)-(5×1) surface is an ideal template for the self-organized formation of one-dimensional nanostructures, such as Fe chains, which may exhibit extraordinary electronic properties like endstates [2], i.e. the zero-dimensional analogon to surface states, or confinement states [3].

We have studied the structural and electronic properties of Fe/Ir(001) using scanning tunneling microscopy (STM) and spectroscopy (STS). At submonolayer coverage our growth studies confirm the results of Ref. [1]. In addition, we find a transition from anisotropic (≤ 2 ML) to isotropic growth (≥ 3 ML) at higher coverages. Low-temperature STS data obtained on bi-atomic Fe chains reveal the existance of pronounced endstates but give no evidence for confinement states.

[1] L. Hammer et al., Phys. Rev. B, 67, 125422 (2003)

[2] J. Crain et al., Science, 307, 703 (2005)

[3] S. Fölsch et al., Phys. Rev. Lett., 92, 056803 (2004)