Bulletin of the American Physical Society
APS March Meeting 2023
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session K61: Electrons, Phonons, Electron-Phonon Scattering and Phononics V
3:00 PM–4:48 PM,
Tuesday, March 7, 2023
Room: Room 418
Sponsoring Units: DCOMP DFD
Chair: Marcelo Jaime, Los Alamos Natl Lab
Abstract: K61.00001 : Engineering thermal transport in low dimensional systems
3:00 PM–3:36 PM
(University of Basel)
(University of Basel)
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. The concept of phonon engineering in nanowires is exploited in GaAs/GaP superlattice nanowires . We experimentally show that a controlled design of the nanowires’ phononic properties can be decided a` 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, with rectification values increasing for larger temperature gradients. The direction of rectification and its dependence on temperature gradient is confirmed by ab- initio calculations using the acoustic mismatch model, taking into account the contribution from interfacial thermal resistance.
Thermal transport in two-dimensional systems is instead investigated using multi-terminal suspended SiNx membranes with resistive elements. These devices enable us to probe thermal transport along different directions as a function of thermal bias.
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.
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