Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 3: 2D Materials: Session I (joint session DS/CPP/HL)
HL 3.1: Vortrag
Montag, 12. März 2018, 09:30–09:45, H 2032
Graphene nanoribbon: electronic band structure, doping and Raman fingerprints — •Boris Senkovskiy1, Dmitry Usachov2, Alexander Fedorov2,3, Gianni Profeta4, Danny Haberer5, Felix Fischer5, and Alexander Grüneis1 — 1II. Institute of Physics, University of Cologne, Cologne, Germany — 2St. Petersburg State University, St. Petersburg,Russia — 3IFW-Dresden, Dresden, Germany — 4Department of Physical and Chemical Sciences and SPIN-CNR, University of L’Aquila , Coppito, Italy — 5Department of Chemistry, University of California at Berkeley, Berkeley, USA
We present the state-of-the-art studies of atomically precise graphene nanoribbons (GNRs) synthesized using on-surface assisted molecular assembly. Using angle-resolved photoemission spectroscopy (ARPES), we obtain the band structure of pristine and boron-doped armchair GNRs of N=7 carbon atoms width. ARPES maps in the full 2D momentum space visualize each sub-band of quasi-1D GNRs and allow to extract effective masses, charge carrier velocities and sub-band energy offsets. Vibration properties of GNRs are probed in-situ by ultra-high vacuum Raman setup. We show how the periodically incorporated boron atoms affect the band structure and the Raman-active modes of GNRs. Particularly, in doped nanoribbons the effective mass of charge carriers is ∼2 times smaller and the peculiar Raman modes are red-shifted and doubled regarding to the pristine system.
[1] Senkovskiy et al. Adv. Electron. Mater. 2017.
[2] Senkovskiy et al. Nano Lett., 2017.
[3] Senkovskiy et al. Phys. Status Solidi RRL, 2017.