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O: Fachverband Oberflächenphysik
O 90: Poster Session VII: Surface reactions I
O 90.5: Poster
Thursday, March 4, 2021, 10:30–12:30, P
On-surface synthesis of graphene nanoribbons on the superconducting Ag/Nb(110) substrate — •Jung-Ching Liu1, Philipp D'astolfo1, Carl Drechsel1, Xunshan Liu2, Silvio Decurtins2, Shi-Xia Liu2, Rémy Pawlak1, and Ernst Meyer1 — 1Department of Physics, University of Basel, Klingelbergstrasse 82, Basel, CH 4056 — 2Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, Bern, CH 3012
Previously, Majorana bound states (MBS) realized in condensed matter systems were based on the interaction between 1D magnetism and s-wave superconductivity[1-3]. To improve the structural diversity for studying MBS braiding, we propose realizing MBSs in graphene sheets or nanoribbons (GNR) through on-surface synthesis[4,5] on a superconducting substrate. Using DBBA as monomers[4], GNR on-surface synthesis is completed via Ullmann polymerization in ultra-high vacuum environment. As the surface reaction is limited on noble metal surfaces, we grow Ag films on the superconducting Nb(110), and introduce superconductivity to Ag by proximity[6]. Measuring with STM and AFM at 4.7K, we confirm proximity-induced superconductivity on Ag with thicknesses up to 5 ML, as well as successful GNR synthesis on the Ag/Nb substrate. We believe our work paves the way to a new research field in graphene topology. References: [1]S. Nadj-Perge et al. Science 2014, 346, 602-607 [2]M. Ruby et al. Nano Lett. 2017, 17, 4473-4477 [3]R. Pawlak et al. Npj Quantum Inf. 2016, 2, 16035 [4]J. Cai et al. Nature 2010, 466, 470-473 [5]K. A. Simonov et al. Nature 2018, 8, 3506 [6]T. Tomanic et al. Phys. Rev. B 2016, 94, 20503