Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures
O 37.103: Poster
Dienstag, 1. April 2014, 18:30–22:00, P2
Silicene on Ag(111): Reconstructions and first tests of laser-induced non-thermal deposition — •Silke Hattendorf1, Christian Kalupka2, Martin Reininghaus2, Marco Pratzer1, and Markus Morgenstern1 — 1II.Institute of Physics B and JARA- FIT, RWTH Aachen — 2Chair for Laser Technology, RWTH Aachen
Silicene, a buckled 2D honeycomb structure made of silicon, was predicted to be stable and exhibit an Dirac cone like graphene[1].
So far, it has been grown on Ag(111)[2], Ir(111)[3] and ZrB2[4]. However, due to strong hybridization with the underlying substrate the Dirac cone is most likely strongly distorted and the silicene states are pushed far into the valence and conduction band[5] making it mandatory to transfer it to a less interacting substrate.
Silicene was grown on Ag(111) at rates between 0.05 and 0.16 ML/min and at a substrate substrate temperature of 200-250∘C. The atomic structure was studied by scanning tunneling microscopy (STM) revealing the known reconstructions (e.g. 4 x 4, √13 x √13)[2].
We tried to transfer the silicene to mica using laser-induced non-thermal deposition [6]. However, possibly due to the strong interaction between the silver and silicene surfaces, this was not successful so far.
[1] S. Cahangirov et. al., PRL 102, 236804 (2009).
[2] P. Vogt et. al., PRL 108, 155501 (2012).
[3] L.Meng et. al., Nano Lett. 13, 685 (2013).
[4] A. Fleurence et. al., PRL 108, 245501 (2013).
[5] Y.Yuan et. al., Arxiv:1310.2420.
[6] M.Reininghaus, APL 100, 151606(2012).