0587988 - FZÚ 2025 RIV US eng J - Journal Article
Šilhavík, Martin - Kumar, Prabhat - Levinský, Petr - Zafar, Zahid Ali - Hejtmánek, Jiří - Červenka, Jiří
Anderson localization of phonons in thermally superinsulating graphene aerogels with metal-like electrical conductivity.
Small Methods. Roč. 8, č. 9 (2024), č. článku 2301536. ISSN 2366-9608. E-ISSN 2366-9608
R&D Projects: GA MŠMT EH22_008/0004558
Institutional support: RVO:68378271
Keywords : Anderson localization * phonon * thermal insulator * charge transport * graphene
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 10.7, year: 2023 ; AIS: 2.444, rok: 2023
Method of publishing: Open access
DOI: https://doi.org/10.1002/smtd.202301536

Here, we report the realization of Anderson localization of phonons in a random three-dimensional elastic network of graphene. We show that thermal conductivity in a cellular graphene aerogel can be drastically reduced to 0.9 mW m-1 K-1 by the application of compressive strain while keeping a high metal-like electrical conductivity of 120 S m-1 and ampacity of 0.9 A. Our experiments reveal that the strain can cause phonon localization over a broad compression range. The remaining heat flow in the material is dominated by charge transport. Conversely, the electrical conductivity exhibits a gradual increase with increasing compressive strain, opposite to the thermal conductivity. These results imply that strain engineering provides the ability to independently tune charge and heat transport, establishing a new paradigm for controlling phonon and charge conduction in solids.
Permanent Link: https://hdl.handle.net/11104/0355083