Strong Coupling of Folded Phonons with Plasmons in 6H-SiC Micro/Nanocrystals
Silicon carbide (SiC) has a large number of polytypes of which 3C-, 4H-, 6H-SiC are most common. Since different polytypes have different energy gaps and electrical properties, it is important to identify and characterize various SiC polytypes. Here, Raman scattering is performed on 6H-SiC micro/nan...
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| Format: | Article |
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MDPI AG
2018-09-01
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| Series: | Molecules |
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| Online Access: | http://www.mdpi.com/1420-3049/23/9/2296 |
| _version_ | 1818021065644834816 |
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| author | Yao Huang Run Yang Shijie Xiong Jian Chen Xinglong Wu |
| author_facet | Yao Huang Run Yang Shijie Xiong Jian Chen Xinglong Wu |
| author_sort | Yao Huang |
| collection | DOAJ |
| description | Silicon carbide (SiC) has a large number of polytypes of which 3C-, 4H-, 6H-SiC are most common. Since different polytypes have different energy gaps and electrical properties, it is important to identify and characterize various SiC polytypes. Here, Raman scattering is performed on 6H-SiC micro/nanocrystal (MNC) films to investigate all four folded transverse optic (TO) and longitudinal optic (LO) modes. With increasing film thickness, the four folded TO modes exhibit the same frequency downshift, whereas the four folded LO modes show a gradually-reduced downshift. For the same film thickness, all the folded modes show larger frequency downshifts with decreasing MNC size. Based on plasmons on MNCs, these folded modes can be attributed to strong coupling of the folded phonons with plasmons which show different strengths for the different folded modes while changing the film thickness and MNC size. This work provides a useful technique to identify SiC polytypes from Raman scattering. |
| first_indexed | 2024-04-14T08:13:48Z |
| format | Article |
| id | doaj.art-7b30279a118e4566b880b1f1dc72e8ae |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-04-14T08:13:48Z |
| publishDate | 2018-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-7b30279a118e4566b880b1f1dc72e8ae2022-12-22T02:04:28ZengMDPI AGMolecules1420-30492018-09-01239229610.3390/molecules23092296molecules23092296Strong Coupling of Folded Phonons with Plasmons in 6H-SiC Micro/NanocrystalsYao Huang0Run Yang1Shijie Xiong2Jian Chen3Xinglong Wu4National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093, ChinaNational Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093, ChinaNational Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093, ChinaNational Laboratory of Solid State Microstructures and Research Institute of Superconductor Electronics, Nanjing University, Nanjing 210093, ChinaNational Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093, ChinaSilicon carbide (SiC) has a large number of polytypes of which 3C-, 4H-, 6H-SiC are most common. Since different polytypes have different energy gaps and electrical properties, it is important to identify and characterize various SiC polytypes. Here, Raman scattering is performed on 6H-SiC micro/nanocrystal (MNC) films to investigate all four folded transverse optic (TO) and longitudinal optic (LO) modes. With increasing film thickness, the four folded TO modes exhibit the same frequency downshift, whereas the four folded LO modes show a gradually-reduced downshift. For the same film thickness, all the folded modes show larger frequency downshifts with decreasing MNC size. Based on plasmons on MNCs, these folded modes can be attributed to strong coupling of the folded phonons with plasmons which show different strengths for the different folded modes while changing the film thickness and MNC size. This work provides a useful technique to identify SiC polytypes from Raman scattering.http://www.mdpi.com/1420-3049/23/9/2296SiC micro/nanocrystalsplasmon–phonon couplingfolded phonons |
| spellingShingle | Yao Huang Run Yang Shijie Xiong Jian Chen Xinglong Wu Strong Coupling of Folded Phonons with Plasmons in 6H-SiC Micro/Nanocrystals Molecules SiC micro/nanocrystals plasmon–phonon coupling folded phonons |
| title | Strong Coupling of Folded Phonons with Plasmons in 6H-SiC Micro/Nanocrystals |
| title_full | Strong Coupling of Folded Phonons with Plasmons in 6H-SiC Micro/Nanocrystals |
| title_fullStr | Strong Coupling of Folded Phonons with Plasmons in 6H-SiC Micro/Nanocrystals |
| title_full_unstemmed | Strong Coupling of Folded Phonons with Plasmons in 6H-SiC Micro/Nanocrystals |
| title_short | Strong Coupling of Folded Phonons with Plasmons in 6H-SiC Micro/Nanocrystals |
| title_sort | strong coupling of folded phonons with plasmons in 6h sic micro nanocrystals |
| topic | SiC micro/nanocrystals plasmon–phonon coupling folded phonons |
| url | http://www.mdpi.com/1420-3049/23/9/2296 |
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