Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 96: Focus Session: Surface Transport at the Atomic Scale
O 96.4: Vortrag
Freitag, 5. April 2019, 11:30–11:45, H15
Length dependent electrical transport trough single polyalanine molecules — •Diana Slawig1, Nguyen Thi Ngoc Ha2, Herbert Pfnür1, and Christoph Tegenkamp1,2 — 1Leibniz Universität Hannover — 2TU Chemnitz
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]. Nevertheless, the electrical transport through helical peptides itself is not completely understood yet. Our study focuses on transport through single polyalanine (PA) molecules by means of mechanically controlled break junctions.
Transport measurements for PA molecules consisting of 16- and 36 monomers revealed two characteristic conductions values accompanied by satellite peaks. The length dependence of the conductance revealed an exponential decay pointing towards tunneling. Moreover, this lengths distribution see in transport correlates nicely with STM investigations showing also PA molecules of various lengths. The conductance through these molecules is comparably high and indicates that superexchange tunnelling may play a role.
[1]R. Naaman et.al., ,J. Phys. Chem. Lett., 3 (2012)
[2]O. Ben Dor et.al.Nat. Commun. 4:2256 (2013)