Datum
2024-02-14Autor
Ungeheuer, ArneBach, NoraMir, Mashood TariqHassanien, Ahmed ShehataNöding, LukasBaumert, ThomasSchäfer, SaschaSenftleben, ArneSchlagwort
530 Physik PhononHalbleiterOptische EigenschaftElektronenbeugungWärmeübertragungHeterostrukturMetadata
Zur Langanzeige
Aufsatz
Coherent acoustic phonons in a coupled hexagonal boron nitride-graphite heterostructure
Zusammenfassung
Femtosecond optically excited coherent acoustic phonon modes (CAPs) are investigated in a free-standing van der Waals heterostructure composed of a 20-nm transparent hexagonal boron nitride (hBN) and a 42-nm opaque graphite layer. Employing ultrafast electron diffraction, which allows for the independent evaluation of strain dynamics in the constituent material layers, three different CAP modes are identified within the bilayer stack after the optical excitation of the graphite layer. An analytical model is used to discuss the creation of individual CAP modes. Furthermore, their excitation mechanisms in the heterostructure are inferred from the relative phases of these modes by comparison with a numerical linear-chain model. The results support an ultrafast heat transfer mechanism from graphite to the hBN lattice system, which is important to consider when using this material combination in devices.
Zitierform
In: Structural Dynamics Volume 11 / Issue 1 (2024-02-14) eissn:2329-7778Förderhinweis
Gefördert durch den Publikationsfonds der Universität KasselZitieren
@article{doi:10.17170/kobra-202403269871,
author={Ungeheuer, Arne and Bach, Nora and Mir, Mashood Tariq and Hassanien, Ahmed Shehata and Nöding, Lukas and Baumert, Thomas and Schäfer, Sascha and Senftleben, Arne},
title={Coherent acoustic phonons in a coupled hexagonal boron nitride-graphite heterostructure},
journal={Structural Dynamics},
year={2024}
}
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2024-03-26T10:22:43Z 2024-03-26T10:22:43Z 2024-02-14 doi:10.17170/kobra-202403269871 http://hdl.handle.net/123456789/15607 Gefördert durch den Publikationsfonds der Universität Kassel eng Namensnennung 4.0 International http://creativecommons.org/licenses/by/4.0/ Phonons Semiconductors Picosecond ultrasonics Heterostructures Heat transfer Optical properties Thin films Carbon based materials Ultrafast electron diffraction 530 Coherent acoustic phonons in a coupled hexagonal boron nitride-graphite heterostructure Aufsatz Femtosecond optically excited coherent acoustic phonon modes (CAPs) are investigated in a free-standing van der Waals heterostructure composed of a 20-nm transparent hexagonal boron nitride (hBN) and a 42-nm opaque graphite layer. Employing ultrafast electron diffraction, which allows for the independent evaluation of strain dynamics in the constituent material layers, three different CAP modes are identified within the bilayer stack after the optical excitation of the graphite layer. An analytical model is used to discuss the creation of individual CAP modes. Furthermore, their excitation mechanisms in the heterostructure are inferred from the relative phases of these modes by comparison with a numerical linear-chain model. The results support an ultrafast heat transfer mechanism from graphite to the hBN lattice system, which is important to consider when using this material combination in devices. open access Ungeheuer, Arne Bach, Nora Mir, Mashood Tariq Hassanien, Ahmed Shehata Nöding, Lukas Baumert, Thomas Schäfer, Sascha Senftleben, Arne 10 Seiten doi:10.1063/4.0000228 Phonon Halbleiter Optische Eigenschaft Elektronenbeugung Wärmeübertragung Heterostruktur publishedVersion eissn:2329-7778 Issue 1 Structural Dynamics Volume 11 false 014501
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