Heat flux induced blueshift of dominant phonon wavelength and its impact on thermal conductivity
The concept of dominant phonon wavelength is investigated in systems submitted to a heat flux at low temperatures. Using spectral energy distributions, a treatment of two-dimensional and three-dimensional structures is conducted in parallel. We demonstrate a significant reduction of the dominant pho...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2017-01-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.4971275 |
| _version_ | 1811303581660217344 |
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| author | Aymeric Ramiere Sebastian Volz Jay Amrit |
| author_facet | Aymeric Ramiere Sebastian Volz Jay Amrit |
| author_sort | Aymeric Ramiere |
| collection | DOAJ |
| description | The concept of dominant phonon wavelength is investigated in systems submitted to a heat flux at low temperatures. Using spectral energy distributions, a treatment of two-dimensional and three-dimensional structures is conducted in parallel. We demonstrate a significant reduction of the dominant phonon wavelength, up to 62%, due to a displacement of the phonon spectrum towards higher frequencies in presence of a heat flux. We name this phenomenon blueshift effect. A formula is provided to directly calculate the corrected dominant phonon wavelength. We illustrate the impact of the blueshift effect by showing that a temperature gradient of 10% at 4K yields a 20% reduction in the thermal conductivity. Therefore, ignoring the blueshift effect in a thermal model can notably alter the physical interpretation of measurements. The results suggest that an appropriate heat flux environment can improve thermoelectric device performances. |
| first_indexed | 2024-04-13T07:49:21Z |
| format | Article |
| id | doaj.art-a7ea5050024a4085b8571045a38fa64c |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-04-13T07:49:21Z |
| publishDate | 2017-01-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-a7ea5050024a4085b8571045a38fa64c2022-12-22T02:55:34ZengAIP Publishing LLCAIP Advances2158-32262017-01-0171015017015017-1110.1063/1.4971275088611ADVHeat flux induced blueshift of dominant phonon wavelength and its impact on thermal conductivityAymeric Ramiere0Sebastian Volz1Jay Amrit2Laboratoire d’Informatique pour la Mécanique et les Sciences de l’Ingénieur (LIMSI/CNRS), UPR 3251, Université Paris Sud, Rue John von Neumann, 91403 Orsay, FranceLaboratoire d’Energétique Moléculaire et Macroscopique, Combustion (EM2C/CNRS), UPR 288, CentraleSupélec, Université Paris-Saclay, 92295 Chatenay-Malabry, FranceLaboratoire d’Informatique pour la Mécanique et les Sciences de l’Ingénieur (LIMSI/CNRS), UPR 3251, Université Paris Sud, Rue John von Neumann, 91403 Orsay, FranceThe concept of dominant phonon wavelength is investigated in systems submitted to a heat flux at low temperatures. Using spectral energy distributions, a treatment of two-dimensional and three-dimensional structures is conducted in parallel. We demonstrate a significant reduction of the dominant phonon wavelength, up to 62%, due to a displacement of the phonon spectrum towards higher frequencies in presence of a heat flux. We name this phenomenon blueshift effect. A formula is provided to directly calculate the corrected dominant phonon wavelength. We illustrate the impact of the blueshift effect by showing that a temperature gradient of 10% at 4K yields a 20% reduction in the thermal conductivity. Therefore, ignoring the blueshift effect in a thermal model can notably alter the physical interpretation of measurements. The results suggest that an appropriate heat flux environment can improve thermoelectric device performances.http://dx.doi.org/10.1063/1.4971275 |
| spellingShingle | Aymeric Ramiere Sebastian Volz Jay Amrit Heat flux induced blueshift of dominant phonon wavelength and its impact on thermal conductivity AIP Advances |
| title | Heat flux induced blueshift of dominant phonon wavelength and its impact on thermal conductivity |
| title_full | Heat flux induced blueshift of dominant phonon wavelength and its impact on thermal conductivity |
| title_fullStr | Heat flux induced blueshift of dominant phonon wavelength and its impact on thermal conductivity |
| title_full_unstemmed | Heat flux induced blueshift of dominant phonon wavelength and its impact on thermal conductivity |
| title_short | Heat flux induced blueshift of dominant phonon wavelength and its impact on thermal conductivity |
| title_sort | heat flux induced blueshift of dominant phonon wavelength and its impact on thermal conductivity |
| url | http://dx.doi.org/10.1063/1.4971275 |
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