STM and ab initio study of holmium nanowires on a Ge(111) Surface

Details STM and ab initio study of holmium nanowires on a Ge(111) Surface STM and ab initio study of holmium nanowires on a Ge(111) Surface

2007-01-10

arxiv.org/abs/cond-mat/0701203v1

Phys. Rev. B 74, 193318 (2006)

Physics

Condensed Matter

Materials Science

4 pages, 12 figures (inc. subfigures). Presented at the the APS March meeting, Baltimore MD, 2006

Scientific paper

10.1103/PhysRevB.74.193318

A nanorod structure has been observed on the Ho/Ge(111) surface using scanning tunneling microscopy (STM). The rods do not require patterning of the surface or defects such as step edges in order to grow as is the case for nanorods on Si(111). At low holmium coverage the nanorods exist as isolated nanostructures while at high coverage they form a periodic 5x1 structure. We propose a structural model for the 5x1 unit cell and show using an ab initio calculation that the STM profile of our model structure compares favorably to that obtained experimentally for both filled and empty states sampling. The calculated local density of states shows that the nanorod is metallic in character.

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