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HL: Fachverband Halbleiterphysik
HL 28: Focus Session: Heat transport at the nanoscale: theory meets experiment
HL 28.3: Invited Talk
Wednesday, March 20, 2024, 10:30–11:00, EW 203
Engineering and probing phonons and thermal transport — •Ilaria Zardo1,2, Begoña Abad1, Chaitanya Arya1, Giulio de Vito1, Yashpreet Kaur1, Dominik M. Koch1, Grazia Raciti1, Aswathi K. Sivan1, Jose M. Sojo1, and Johannes Trautvetter1 — 1Department of Physics, University of Basel, Basel, Switzerland — 2Swiss Nanoscience Institute, University of Basel, Basel, Switzerland
The recently growing research field called "Nanophononics" deals with the investigation and control of vibrations in solids at the nanoscale. Phonon engineering leads to a controlled modification of phonon dispersion, phonon interactions, and transport. However, engineering and probing phonons and phonon transport at the nanoscale is a non-trivial problem.
In this talk, we discuss how phononic properties and thermal transport can be engineered and measured in nanowires and the challenges and progresses in the measurement of the thermal conductivity of nanostructures and low dimensional systems. We experimentally show that a controlled design of the nanowires' phononic properties can be decided à la carte by tuning the superlattice period. We also investigated thermal rectification in semiconducting gallium arsenide nanowires with an abrupt change in diameter, also called telescopic nanowires. We measured rectification values ranging from 2 to 7% at a range of ambient temperatures. Finally, Raman thermometry is used to probe the temperature profile in nanostructures upon application of a thermal gradient, enabling the differentiation between different thermal transport regimes.
Keywords: phonons; thermal transport; nanophononics; pump-probe spectroscopy