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Dresden 2020 – scientific programme

The DPG Spring Meeting in Dresden had to be cancelled! Read more ...

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AKE: Arbeitskreis Energie

AKE 4: Renewable Energy - Photovoltaics and Electronic Processes

AKE 4.5: Talk

Monday, March 16, 2020, 16:15–16:30, DÜL

Impact of Interface Roughness on Thermal Transport in Half-Heusler Superlattices — •Sven Heinz1,2 and Gerhard Jakob1,21Institut für Physik, Uni Mainz, Deutschland — 2Graduate School of Excellence MAINZ, Mainz, Deutschland

In periodic multilayer structures a large portion of heat can be transported by so called ''coherent'' phonons [1]. The periodic multilayer structure leads to the formation of stop-bands: certain wavelength bands are suppressed for phonon transport, thereby potentially reducing thermal conductivity [2]. For these effects to be observed, the roughness of the interfaces has to be as low as possible [2].

Investigations will be presented on multilayer structures, in which the interface quality is purposefully deteriorated in part of the sample series by introducing an artificial intermixing layer. This is done by altering the layer sequence from ABAB to ACBCACBC, where C is a mixture of Material A and B. The thin intermixing layer simulates an increased interface roughness, thus destroying coherent transport. Additionally, the intermixing layer can act as a transition layer, lowering the acoustic contrast between the main layers A and B, acting as a so-called phonon bridge [3]. Both effects are discussed in the presentation.

[1] M.N. Luckyanova et al., Science 338 (2012) 936-939.

[2] M. Maldovan, Nat. Mater. 14 (2015) 667-674.

[3] P. Chakraborty et al., Sci. Rep. 7 (2017) 1-8.

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