Radiative heat exchange driven by acoustic modes between two solids at the atomic scale
In the near field (for separation distances smaller than the thermal wavelength, of the order of some microns at ambient temperature), the radiative heat flow between two solids at different temperatures can exceed the blackbody limit by several orders of magnitude. Furthermore, at the atomic scale,...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2023-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2023/13/epjconf_eosam2023_04012.pdf |
| _version_ | 1797634813504520192 |
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| author | Gómez Viloria Mauricio Guo Yangyu Merabia Samy Messina Riccardo Ben-Abdallah Philippe |
| author_facet | Gómez Viloria Mauricio Guo Yangyu Merabia Samy Messina Riccardo Ben-Abdallah Philippe |
| author_sort | Gómez Viloria Mauricio |
| collection | DOAJ |
| description | In the near field (for separation distances smaller than the thermal wavelength, of the order of some microns at ambient temperature), the radiative heat flow between two solids at different temperatures can exceed the blackbody limit by several orders of magnitude. Furthermore, at the atomic scale, close to contact, the vibrational modes of the crystal lattice are expected to play an important role in the heat exchange. While the contribution of acoustic phonons tunnel-ing due to Van der Waals forces and electrostatic interactions near the surface has been investigated [1–5], the radiative contribution of the acoustic modes has been neglected so far. Under the local assumption (wavevector k ≈ 0), optical modes are independent from the acoustic modes, and are the sole responsible for the thermal radiation for distances larger than a few nanometers. However at subnanometer distances, the electromagnetic response of solids is nonlocal (k ≠ 0) and both acoustic and optical modes are coupled, contributing together to the radiative heat exchange. In order to demonstrate the role of this contribu-tion, we calculate [6] the nonlocal dielectric permittivity of magnesium oxide (MgO) using molecular dynamics. In conjunction with fluctuational electrody-namics calculations, we are able to highlight the role of radiation between two polar crystals produced by acoustic modes compared to the expected results from the local theory. We show that this additional contribution can become the dominant channel for radiative heat exchanges at atomic scale in the cryo-genic regime (below 100 K). Since the acoustic vibration modes can be excited with the help of piezoelectric transducers, our work opens the possibility to the control of radiative heat exchanges at atomic scale using external mechanical actuation. |
| first_indexed | 2024-03-11T12:13:46Z |
| format | Article |
| id | doaj.art-81abd92844bb4fe8a33cb128bcf79a22 |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-03-11T12:13:46Z |
| publishDate | 2023-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-81abd92844bb4fe8a33cb128bcf79a222023-11-07T10:20:47ZengEDP SciencesEPJ Web of Conferences2100-014X2023-01-012870401210.1051/epjconf/202328704012epjconf_eosam2023_04012Radiative heat exchange driven by acoustic modes between two solids at the atomic scaleGómez Viloria Mauricio0Guo Yangyu1Merabia Samy2Messina Riccardo3Ben-Abdallah Philippe4Laboratoire Charles Fabry, UMR 8501, Institut d’Optique, CNRS, Université Paris-SaclayInstitut Lumière Matière, Université Claude Bernard Lyon 1, CNRS, Université de LyonInstitut Lumière Matière, Université Claude Bernard Lyon 1, CNRS, Université de LyonLaboratoire Charles Fabry, UMR 8501, Institut d’Optique, CNRS, Université Paris-SaclayLaboratoire Charles Fabry, UMR 8501, Institut d’Optique, CNRS, Université Paris-SaclayIn the near field (for separation distances smaller than the thermal wavelength, of the order of some microns at ambient temperature), the radiative heat flow between two solids at different temperatures can exceed the blackbody limit by several orders of magnitude. Furthermore, at the atomic scale, close to contact, the vibrational modes of the crystal lattice are expected to play an important role in the heat exchange. While the contribution of acoustic phonons tunnel-ing due to Van der Waals forces and electrostatic interactions near the surface has been investigated [1–5], the radiative contribution of the acoustic modes has been neglected so far. Under the local assumption (wavevector k ≈ 0), optical modes are independent from the acoustic modes, and are the sole responsible for the thermal radiation for distances larger than a few nanometers. However at subnanometer distances, the electromagnetic response of solids is nonlocal (k ≠ 0) and both acoustic and optical modes are coupled, contributing together to the radiative heat exchange. In order to demonstrate the role of this contribu-tion, we calculate [6] the nonlocal dielectric permittivity of magnesium oxide (MgO) using molecular dynamics. In conjunction with fluctuational electrody-namics calculations, we are able to highlight the role of radiation between two polar crystals produced by acoustic modes compared to the expected results from the local theory. We show that this additional contribution can become the dominant channel for radiative heat exchanges at atomic scale in the cryo-genic regime (below 100 K). Since the acoustic vibration modes can be excited with the help of piezoelectric transducers, our work opens the possibility to the control of radiative heat exchanges at atomic scale using external mechanical actuation.https://www.epj-conferences.org/articles/epjconf/pdf/2023/13/epjconf_eosam2023_04012.pdf |
| spellingShingle | Gómez Viloria Mauricio Guo Yangyu Merabia Samy Messina Riccardo Ben-Abdallah Philippe Radiative heat exchange driven by acoustic modes between two solids at the atomic scale EPJ Web of Conferences |
| title | Radiative heat exchange driven by acoustic modes between two solids at the atomic scale |
| title_full | Radiative heat exchange driven by acoustic modes between two solids at the atomic scale |
| title_fullStr | Radiative heat exchange driven by acoustic modes between two solids at the atomic scale |
| title_full_unstemmed | Radiative heat exchange driven by acoustic modes between two solids at the atomic scale |
| title_short | Radiative heat exchange driven by acoustic modes between two solids at the atomic scale |
| title_sort | radiative heat exchange driven by acoustic modes between two solids at the atomic scale |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2023/13/epjconf_eosam2023_04012.pdf |
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