Semiballistic thermal conduction in polycrystalline SiGe nanowires
| Autor: | Masahiro Nomura, Noboru Okamoto, Ryoto Yanagisawa, Md. Mahfuz Alam, Kentarou Sawano, Roman Anufriev, Masashi Kurosawa |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Physics and Astronomy (miscellaneous) Condensed matter physics Alloy Nanowire 02 engineering and technology engineering.material Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Thermal conduction Alloy composition 01 natural sciences Length dependence Condensed Matter::Materials Science Thermal conductivity 0103 physical sciences engineering Crystallite 0210 nano-technology Nanoscopic scale |
| Zdroj: | Applied Physics Letters. 115:253101 |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | Ballistic heat conduction remains a controversial nanoscale phenomenon because of its occurrence and strength depending on the material, alloy composition, and temperature. Here, we discuss the impact of ballistic thermal conduction and compare the results with theoretical predictions. We experimentally investigate ballistic thermal transport in SiGe polycrystalline nanowires by measuring the length dependence of thermal conductivity for different alloy compositions and temperatures. At room temperature, our experiments show that ballistic effects are negligible in nanowires made of pure polycrystalline Si but become stronger as the Ge composition increases. As we decreased the temperature, we observed that ballistic contribution becomes even stronger.Ballistic heat conduction remains a controversial nanoscale phenomenon because of its occurrence and strength depending on the material, alloy composition, and temperature. Here, we discuss the impact of ballistic thermal conduction and compare the results with theoretical predictions. We experimentally investigate ballistic thermal transport in SiGe polycrystalline nanowires by measuring the length dependence of thermal conductivity for different alloy compositions and temperatures. At room temperature, our experiments show that ballistic effects are negligible in nanowires made of pure polycrystalline Si but become stronger as the Ge composition increases. As we decreased the temperature, we observed that ballistic contribution becomes even stronger. |
| Databáze: | OpenAIRE |
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