Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 64: Scanning Probe Techniques: Method development

O 64.10: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-OG3

Lateral manipulation of single iron-adatoms with CO terminated tips by combined STM/AFM — •Julian Berwanger, Ferdinand Huber, and Franz Josef Giessibl — Institute for Experimental an Applied Physics, University of Regensburg, 93040 Regensburg

By positioning single iron adatoms with a scanning probe microscope on a Cu(111) surface, spin-based logical operators and quantum bits can be built on the atomic scale [1,2]. Building these devices requires a precise, controlled and reproducible mechanism for positioning single adatoms. CO terminated tips allows to image metal clusters with atomic resolution [3]. We performed lateral manipulation of single iron adatoms with a combination of scanning tunneling and atomic force microscopy using monoatomic Cu- and CO-terminated tips. For both types of tips we find that the force responsible for the manipulation is purely attractive and the predicted diffusion barrier of 28.5meV [4] is lowered due to the presence of the tips [5] by about 70%. Moreover, this work demonstrates the feasibility of using the high resolution capability of a CO tip [6] and simultaneously manipulating adatoms laterally without the need of changing the tip before.

[1] A. A. Khajetoorians et al. Science 332, 1062 (2011)

[2] S. Loth et al. Science 335, 196 (2012)

[3] M. Emmrich et al. Science 348, 6232 (2015)

[4] N. N. Negulyaev et al. PRB 79, 195411 (2009)

[5] M. Emmrich et al. PRL 114, 146101 (2015)

[6] L. Gross et al. Science 325, 110 (2009)