Berlin 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 74: Molecular Electronics and Photonics

TT 74.4: Vortrag

Mittwoch, 14. März 2018, 16:45–17:00, H 3005

Switching the conductance of molecular junctions by proton transfer — •Dominik Weckbecker¹, Pedro B. Coto¹, and Michael Thoss^{1, 2} — ¹FAU Erlangen-Nürnberg, Institut für Theoretische Physik, Staudtstrasse 7/B2, 91058 Erlangen, Germany — ²Universität Freiburg, Physikalisches Institut, Hermann-Herder-Str. 3, 79104 Freiburg

While most experiments on single-molecule junctions have employed metal electrodes, recent works demonstrate that graphene has a number of advantages over metallic leads [1-2]. In this contribution, we investigate charge transport in graphene-molecule junctions employing a theoretical approach that combines first-principles electronic structure methods with nonequilibrium Green’s function transport theory [3]. Specifically, we consider zigzag and armchair terminated graphene leads with covalently bonded molecular bridges. We analyze the possibility to use a proton transfer reaction as novel mechanism for switching the conductance of a molecular junction. Our simulations demonstrate that an intramolecular proton transfer can change the conductance of the graphene-molecule junction significantly [4]. While a proton transfer parallel to the transport direction could be used to realize a molecular switch or diode, a junction with a perpendicular proton transfer can resemble a transistor.
K. Ullmann et al., Nano Lett. 15, 3512 (2015)
C. Jia et al., Science 352, 1443 (2016)
M. Brandbyge et al., Phys. Rev. B 65, 165401 (2002)
D. Weckbecker et al., Nano Lett. 17, 3341 (2017)