Pulling and Stretching a Molecular Wire to Tune its Conductance

Gaël Reecht; Hervé Bulou; Fabrice Scheurer; Virginie Speisser; Fabrice Mathevet; César González; Yannick J. Dappe; Guillaume Schull

Pulling and Stretching a Molecular Wire to Tune its Conductance

Gaël Reecht ¹ Hervé Bulou ¹ Fabrice Scheurer ¹ Virginie Speisser ¹ Fabrice Mathevet ² César González ³ Yannick J. Dappe ³ Guillaume Schull ^{1, *}

* Corresponding author

1 IPCMS - Institut de Physique et Chimie des Matériaux de Strasbourg

2 IPCM - Institut Parisien de Chimie Moléculaire

3 SPEC - UMR3680 - Service de physique de l'état condensé

Abstract : A scanning tunnelling microscope is used to pull a polythiophene wire from a Au(111) surface while measuring the current traversing the junction. Abrupt current increases measured during the lifting procedure are associated with the detachment of molecular subunits, in apparent contradiction with the expected exponential decrease of the conductance with wire length. Ab initio simulations reproduce the experimental data and demonstrate that this unexpected behavior is due to release of mechanical stress in the wire, paving the way to mechanically gated single-molecule electronic devices.

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Journal articles

Domain :

Physics [physics]

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Submitted on : Wednesday, September 14, 2016 - 3:55:36 PM
Last modification on : Thursday, September 26, 2019 - 10:58:03 AM

Pulling and Stretching a Molecular Wire to Tune its Conductance

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Pulling and Stretching a Molecular Wire to Tune its Conductance

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