Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 40: Transport: Molecular Electronics and Photonics (jointly with CPP, HL, MA, O)

TT 40.1: Vortrag

Mittwoch, 22. März 2017, 09:30–09:45, HSZ 201

Negative differential conductance in single-molecule junctions with ferromagnetic electrodes — •Peter Hasch, Yuxiang Gong, Li Jiang, Carlos-Andres Palma, Joachim Reichert, and Johannes V. Barth — Physics Department E20, Technische Universität München, Germany

Scaling down logic operations to the level of single molecules might be considered the next frontier in computation. One approach is to electrically control single spin states in a molecule, trapped between two electrodes.

Here we report the observance of a negative differential conductance (NDC), measured in a single-molecule junction. The investigated NDC could be explained by a single-spin phenomenon, arising when the molecule gets charged due to voltage-induced depopulation of the highest occupied molecular orbital. This oxidation is monitored by Raman spectroscopy, which allows to analyze chemical and electronical structures with a single-molecule sensitivity. By (anti)ferromagnetic coupling of the unpaired spin on the molecule to one of the electrodes, the molecule might act as a spin-valve, blocking charge transport of the opposite spin direction.

Single-molecule NDC elements bear considerable potential for logical crossbar architectures, and could shrink the actual state of the art devices significantly in size.