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O: Fachverband Oberflächenphysik
O 73: Organic Molecules on Inorganic Substrates V: Adsorption, Growth and Networks
O 73.2: Vortrag
Mittwoch, 18. März 2020, 15:15–15:30, TRE Phy
Boron-doping Induced States in Single Graphene Nanoribbons Probed in Transport Measurements — •Niklas Friedrich1, Pedro Brandimarte2, Jingcheng Li1, Thomas Frederiksen2, Aran Garcia-Lekue2, Daniel Sánchez-Portal3, and J.I. Pascual1 — 1CIC nanoGUNE, San Sebastian (Spain) — 2Donostia International Physics Center, San Sebastian (Spain) — 3Centro de Física de Materiales, San Sebastian (Spain)
Bottom-up synthesized graphene nanoribbons (GNRs) are a versatile playground for engineering electronic properties of low-dimensional systems. Numerous predictions state that certain GNR shapes carry zero energy states hosting an even number of electrons. Despite their large potential for spintronics, the synthesis and observation of magnetism in graphene-based structures is so far very limited.
Here, we show that a spin-polarized state can be induced in 7-armchair GNRs by substitutional Boron-doping of two central Carbon atoms. Electronic transport measurements through a B-doped GNR suspended between the Au(111) substrate and the tip of scanning tunnelling microscope reveal a zero-bias Kondo resonance, attributed to the induced spin-polarization. Density functional theory simulations confirm an emerging spin-polarization in the GNR upon detachment of the dopant from the surface.
Simulations also reveal strong kinetic exchange interactions between doping sites within the same GNR, which modifies the net spin-polarization of the ribbon. Our experimental transport results confirm the presence of such a non-conventional spin texture.