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Transport phenomena at interfaces include amongst others the transport of heat or charges, which are of eminent importance in electronic or energy harvesting devices [1]. By using pulsed x-ray scattering with 80 ps time resolution following laser excitation of thin films [2] we were able to resolve the caloric balance in layered structures of gold and a skutterudite, CoSb$_3$. From the dynamics of heat distribution we conclude on the importance of energy transport across the gold-CoSb$_3$ interface, which is to a large part carried not by phonons, but by the heated electron gas. Gold is known as a good source for injecting electrons in coupled subsystems due to its weak electron-phonon coupling. The amount of heat transfer across the interface suggests additional transport by ballistic electrons [3].
[1] H. Bracht, S. Eon, R. Frieling, A. Plech, D. Issenmann, D. Wolf, J. Lundsgaard Hansen, A. Nylandsted Larsen, J. W. Ager III, E. E. Haller, New J. Phys. 16, 015021 (2014)
[2] A. Plech, B. Krause, T. Baumbach, M. Zakharova, S. Eon, C. Girmen, G. Buth and H. Bracht, nanomaterials 9, 501 (2019).
[3] A. Plech, P. Gaal, D. Schmidt, M. Levantino, M. Daniel, S. Stankov, G. Buth and M. Albrecht, New J. Phys. (2024) submitted.
| Please select the related topic from the list below | Dynamics of surfaces, interfaces, and nanostructures |
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