Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 28: Focus Session: Heat transport at the nanoscale: theory meets experiment

HL 28.4: Invited Talk

Wednesday, March 20, 2024, 11:15–11:45, EW 203

Challenges and opportunities of thermally anisotropic materials — •Sebastian Reparaz — Materials Science Institute of Barcelona (ICMAB)

The study of the thermal conductivity (or diffusivity) tensor (κij) in bulk and low dimensional materials has gained considerable momentum in recent years. A large number of experimental methods to study the out-of-plane components of the thermal conductivity have been developed and successfully demonstrated using different methodologies, e.g., based on electrical or optical methods. On the other hand, the study of in-plane thermal transport is comparatively more challenging due to the lack of sensitivity to this component of most developed methods, among other reasons. I will discuss two complementary experimental approaches recently developed with enhanced sensitivity to thermal anisotropy and, in particular, to in-plane thermal transport, which are based on using a 1D heat source with uniform power distribution along its long axis. I will show the application of these recently developed methodologies to study the thermal properties of a large variety of samples, with special focus on determining the thermal conductivity tensor elements. In particular, I will address the following list of materials: β-Ga2O3; highly oriented pyrolytic graphite (HOPG); suspended silicon and polymer membranes with different thicknesses; bismuth, silicon, glass, AlN, GaN, ZnO, and ZnS substrates; and several Van der Waals materials such as PdSe2, hence, demonstrating their excellent performance and rather simple data analysis procedure.

Keywords: thermal conductivity; thermal anisotropy; contactless method