Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 99: Poster Session: Transport
TT 99.9: Poster
Donnerstag, 15. März 2018, 15:00–19:00, Poster B
Electrical Characterization of Polyalanine Molecules — •Diana Slawig1, Malte Böhsl1, Herbert Pfnür1, and Christoph Tegenkamp1,2 — 1Leibniz Universität Hannover, Germany — 2TU Chemnitz, Germany
A new promising and effective approach for spintronics has emerged using spin selectivity in electron transport through chiral molecules, named Chiral Induced Spin Selectivity (CISS) [1]. Recently, by utilizing this effect a proof of concept for a new type of chiral-based Si-compatible universal magnetic memory device was demonstrated [2]. Therefore the electrical transport through helical peptides is of high interest. Our study focuses on polyalanine molecules for their high conductivity over a long range [3] and their large intrinsic dipole [4].
The molecules were contacted using mechanically controlled break junctions made of gold, operating in high vacuums.
Systematic conduction measurements revealed different states, which in turn are split up. This indicates different configurations either of the thiole-gold bond or configuration of the molecules itself.
Current Voltage measurements show a large asymmetry in the curves, which can be traced back to the dipole of the molecule [5,6].
[1] R. Naaman et.al., J. Phys. Chem. Lett. 3 (2012)
[2] O. Ben Dor et al., Nat. Commun. 4:2256 (2013)
[3] Y. Arikuma et.al., Angew. Chem., Int. Ed.,49 (2010)
[4] D. Cristancho et al., J.Chem.Phys. 132, 065102 (2010).
[5] S. Sek et al., J. Phys. Chem. B, 109 (2005).
[6] H. Uji, Phys. Chem. Chem. Phys. 757, 15 (2013).