Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: 2D materials beyond graphene: TMDCs, silicene and relatives II
O 58.4: Vortrag
Mittwoch, 14. März 2018, 11:15–11:30, MA 043
STM Study of Current-Induced Forces in Graphene Nanoribbons on Au(111) — •Tobias Preis1, Sasha Vrbica2, Nemanja Kocic1, Ulrike Paap1, Jonathan Eroms1, Dieter Weiss1, Jan van Ruitenbeek2, and Jascha Repp1 — 1Universität Regensburg, Institut für Experimentelle und Angewandte Physik - Regensburg, Germany — 2Leiden University, Huygens-Kamerlingh Onnes Laboratorium - Leiden, Netherlands
In electromigration, an electrical current flowing through a material exerts a force on atoms in the material or on its surface eventually leading to a displacement of these atoms. Although this phenomenon is technologically relevant for device reliability and has been addressed both theoretically [1] and experimentally [2] it is not fully understood yet. Electromigration of single gold atoms on a Ni(111) surface was reported based on scanning tunneling microscopy (STM) experiments [3].
Here, we address this issue with a very similar approach as in [3] but for single cobalt atoms adsorbed on narrow graphene nanoribbons adsorbed on a metal surface. By approaching the ribbons with an STM tip and injecting current pulses we observe motion of the adatoms predominantly along the ribbons. We could not observe a preferential direction with respect to a motion towards versus away from the tip.
[1] P. J. Rous et al., Phys. Rev. B 62, 8478-8486 (2000)
[2] B. C. Regan et al., Nature 428, 924-927 (2004)
[3] K.-F. Braun et al., Appl. Phys. Lett. 90, 023118 (2007)