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

C. Eames, C. Bonet, M. I. J. Probert, S. P. Tear, and E. W. Perkins
Phys. Rev. B 74, 193318 – Published 29 November 2006

Abstract

A nanorod structure has been observed on the HoGe(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 5×1 structure. We propose a structural model for the 5×1 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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  • Received 12 July 2006

DOI:https://doi.org/10.1103/PhysRevB.74.193318

©2006 American Physical Society

Authors & Affiliations

C. Eames, C. Bonet, M. I. J. Probert, and S. P. Tear*

  • Department of Physics, University of York, York YO10 5DD, United Kingdom

E. W. Perkins

  • School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom

  • *Corresponding author. Email address: spt1@york.ac.uk

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Issue

Vol. 74, Iss. 19 — 15 November 2006

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