Regensburg 2007 – wissenschaftliches Programm

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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices

SYOE 7: Single Molecule Contacts

SYOE 7.4: Vortrag

Dienstag, 27. März 2007, 17:45–18:00, H32

Kondo effect by controlled cleavage of a single molecule contact — •Ruslan Temirov and Stefan Tautz — International University Bremen, Bremen, Germany (Jacobs University Bremen as of spring 2007)

Contact properties are one of the unresolved challenges in the rapidly growing field of molecular electronics. Here we present a single molecule transport experiment with optimum control over contacts, carried out in an STM in a symmetric configuration, i.e. with a molecule between two chemical contacts. We start with a geometrically and spectroscopically well-characterized chemical bond between a π-conjugated molecule and a single crystalline metal surface and vary this contact by a controllable and gradual structural modification, until the metal-molecule bond is cleaved. In this way, the molecular wire is tuned smoothly from the mixed-valence strong-coupling to the intermediate-coupling Kondo regime, in which electron transport is highly correlated, and beyond, up to the point when the contact is cleaved. This tuning is achieved by a gradual de-hybridisation of a molecular orbital from the metallic states due to mechanical stress [1].

[1] R. Temirov and S. Tautz. cond-mat/0612036.