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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 84: Molecular Electronics and Photonics (joint session TT/CPP)

CPP 84.4: Vortrag

Mittwoch, 18. März 2020, 18:45–19:00, HSZ 304

Electrical transport through single polypeptides — •Diana Slawig¹, Nguyen Thi Ngoc Ha², Yossi Paltiel³, Shira Yoshelis³, and Christoph Tegenkamp^1,2 — ¹Leibniz Universität Hannover, Germany — ²TU Chemnitz, Germany — ³Hebrew University Jerusalem, Israel

The analysis of electrical transport through helical molecules gained a lot of interest within the last years, due to the unique spin filtering properties, named chiral induced spin selectivity (CISS) [1]. By utilizing this effect a proof of concept for a new type of chiral-based Si-compatible universal magnetic memory device was demonstrated [2]. Nevertheless, the electrical transport through helical peptides itself is not completely understood yet.
Our study focuses on transport through single lysine doped polyalanine (PA) molecules by means of mechanically controlled break junction. Molecular fragments containing different numbers of monomers were used to evaluate the length dependent transport behavior, leading to a strong indication for a tunneling dominated mechanism.
Based on the high number of observed stable conductance states in the statistical analysis, we propose a ratcheting model based on geometrical alignments of the molecules. This concept is closely related to the interdigitation effect observed by STM[3].

[1] R. Naaman et al., J. Phys. Chem. Lett., 3 (2012)

[2] O.Ben Dor et al., Nat. Commun. 4:2256 (2013)

[3] T. N.H. Nguyen et al., J. Phys. Chem. C 123, 612 (2019)