Volume 83, Number 5, September 2008
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||19 August 2008|
Transport signature of pseudo Jahn-Teller dynamics in a single-molecule transistor
Institut für Theoretische Physik A, RWTH Aachen - 52056 Aachen, Germany, EU
2 Institut für Festkörper-Forschung - Theorie 3, Forschungszentrum Jülich - 52425 Jülich, Germany, EU
3 JARA - Fundamentals of Future Information Technology
Accepted: 17 July 2008
We calculate the electronic transport through a molecular dimer, in which an excess electron is delocalized over equivalent monomers, which can be locally distorted. In this system the Born-Oppenheimer approximation breaks down resulting in quantum entanglement of the mechanical and electronic motion. We show that pseudo Jahn-Teller (pJT) dynamics of the molecule gives rise to conductance peaks that indicate this violation. Their magnitude, sign and position sharply depend on the electro-mechanical properties of the molecule, which can be varied in recently developed three-terminal junctions with mechanical control. The predicted effect depends crucially on the degree of intramolecular delocalization of the excess electron, a parameter which is also of fundamental importance in physical chemistry.
PACS: 85.65.+h – Molecular electronic devices / 71.70.Ej – Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect / 85.85.+j – Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
© EPLA, 2008
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.