Professor Andrew Briggs is the inaugural holder of the Chair of Nanomaterials at the University of Oxford. His research interests focus on materials and techniques for quantum technologies and their incorporation into practical devices. Current hot topics include vibrational states of nanotubes and charge transport through single molecules in graphene nanogaps, and machine learning for measuring and tuning quantum devices. He has more than 650 publications, with over 28,000 citations.
Charge-State Dependent Vibrational Relaxation in a Single-Molecule Junction
Phys. Rev. Lett. [PDF]
|The outcome of an electron-transfer process is determined by the quantum-mechanical interplay between electronic and vibrational degrees of freedom.
Nonequilibrium vibrational dynamics are known to direct electron-transfer mechanisms in molecular systems; however the structural features of a molecule that lead to certain modes being pushed out of equilibrium are not well understood.
Herein, we report on electron transport through a porphyrin dimer molecule, weakly coupled to graphene electrodes, that displays sequential tunneling within the Coulomb-blockade regime.
The sequential transport is initiated by current-induced phonon absorption and proceeds by rapid sequential transport via a nonequilibrium vibrational distribution of low-energy modes, likely related to torsional molecular motions.
We demonstrate that this is an experimental signature of slow vibrational dissipation and obtain a lower bound for the vibrational relaxation time of 8 ns, a value dependent on the molecular charge state.
- Statistical signature of electrobreakdown in graphene nanojunctions. C Evangeli, S Tewari, JM Kruip, X Bian, JL Swett, J Cully, J Thomas, G Andrew D Briggs, Jan A Mol. Proceedings of the National Academy of Sciences 119 (27), e2119015119 (2022) [PDF]
- Implementation of Quantum Level Addressability and Geometric Phase Manipulation in Aligned Endohedral Fullerene Qudits. Shen Zhou, Jiayue Yuan, Zi‐Yu Wang, Kun Ling, Peng‐Xiang Fu, Yu‐Hui Fang, Ye‐Xin Wang, Zheng Liu, Kyriakos Porfyrakis, G Andrew D Briggs, Song Gao, Shang‐Da Jiang. Angewandte Chemie [PDF]
- Phase-Coherent Charge Transport through a Porphyrin Nanoribbon-Graphene Junction. Zhixin Chen, Jie-Ren Deng, Songjun Hou, Xinya Bian, Jacob L Swett, Qingqing Wu, Jonathan Baugh, G Andrew D Briggs, Jan A Mol, Colin J Lambert, Harry L Anderson, James O Thomas. arXiv:2205.08499 [PDF]
- Identifying Pauli spin blockade using deep learning. Jonas Schuff, Dominic T Lennon, Simon Geyer, David L Craig, Federico Fedele, Florian Vigneau, Leon C Camenzind, Andreas V Kuhlmann, G Andrew D Briggs, Dominik M Zumbühl, Dino Sejdinovic, Natalia Ares. arXiv:2202.00574 [PDF]
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View the two-part documentary film of The Penultimate Curiosity which Roger Wagner and Andrew Briggs made. The film includes sequences flying to locations in Europe and beyond, as well as in Galloway, Cambridge, and Oxford.