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Measuring the thermoelectric properties of single molecules and low-dimensional materials, Webinar with Dr Pascal Gehring

Image: Dr Pascal Gehring
Dr Pascal Gehring

Date: 8 June 2020   Time: 15:00 - 16:00

Join us for our next CCMMP/MRI Webinar with Dr Pascal Gehring, Delft University of Technology, Delft, Holland. Pascal is a postdoc in the Department of Quantum Nanoscience and will present his latest research at this CCMMP/MRI webinar.

Title: 'Measuring the thermoelectric properties of single molecules and low-dimensional materials' Go to: shorturl.at/gCS28


Abstract:
Theory predicts that heat-to-charge conversion is so efficient in single molecules, that they hold unexplored potential as building blocks for thermoelectric energy harvesting. Empirical verification of these predictions is, however, still to come, because of the considerable experimental challenges. In this talk, I will present our recent progress on experimental, thermoelectric studies of single molecules. We unravel the spin-entropy variations associated with electron flow through molecules, extracting detailed information about the molecular ground and excited states. We use a novel measurement protocol that simultaneously probes the DC and AC conductances and the thermocurrent flow as a function of bias- and gate-voltage. We show that the thermocurrent maps can be reproduced by a rate-equation model incorporating vibrational states and degeneracies, thus allowing direct insight into the interplay of spin and vibrational degrees of freedom in single-molecule spintronics. These results open the path to the use of thermocurrent for the study of the internal processes during transport in single magnetic molecules. Moreover, they offer a fundamental tool necessary for the fundamental study of spin-flip and decoherence or Kondo correlations in single molecule systems out of equilibrium.

The Speaker:
In my current position at imec, I explore new materials for future memory or thermoelectric devices. Previously I focused on thermoelectric behaviour of (exotic) single molecule devices (Marie Curie Fellow @TU Delft 2017-2019; Senior Researcher and PostDoc @University of Oxford 2014-2017). During my PhD (@EPFL and Max-Planck Institute for Solid State Research 2010 -2014) I investigated the magnetotransport properties of topological insulators.

Location:  Talk is available at the link below
Contact:  Dr Jan Mol
Email:  j.mol@qmul.ac.uk
Website:  http://shorturl.at/gCS28