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http://hdl.handle.net/1843/43795| Type: | Artigo de Periódico |
| Title: | Probing spatial phonon correlation length in post-transition metal monochalcogenide GaS using Tip-Enhanced Raman Spectroscopy |
| Authors: | Rafael Silva Alencar Luiz Gustavo de Oliveira Lopes Cançado Ado Jorio de Vasconcelos Cassiano Rabelo e Silva Hudson Luiz Silva de Miranda Thiago de Lourenço e Vasconcelos Bruno Santos de Oliveira Aroldo Ribeiro Lopes Neto Bruno Carvalho Públio Jenaina Ribeiro Soares Antônio Gomes Souza Filho |
| Abstract: | The knowledge of the phonon coherence length is of great importance for two-dimensional-based materials since phonons can limit the lifetime of charge carriers and heat dissipation. Here we use tip-enhanced Raman spectroscopy (TERS) to measure the spatial correlation length Lc of the A11g and A2 1g phonons of monolayer and few-layer gallium sulfide (GaS). The differences in Lc values are responsible for different enhancements of the A1g modes, with A11 g always enhancing more than the A21g, independently of the number of GaS layers. For five layers, the results show an Lc of 64 and 47 nm for A11g and A21g, respectively, and the coherence lengths decrease when decreasing the number of layers, indicating that scattering with the surface roughness plays an important role. |
| Subject: | Fônons Nanomateriais Espectroscopia de Raman |
| language: | eng |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | ENG - DEPARTAMENTO DE ENGENHARIA ELÉTRICA ICX - DEPARTAMENTO DE FÍSICA |
| Rights: | Acesso Restrito |
| metadata.dc.identifier.doi: | http://doi.org/10.1021/acs.nanolett.9b02974 |
| URI: | http://hdl.handle.net/1843/43795 |
| Issue Date: | 2019 |
| metadata.dc.url.externa: | https://pubs.acs.org/doi/10.1021/acs.nanolett.9b02974 |
| metadata.dc.relation.ispartof: | Nano Letters |
| Appears in Collections: | Artigo de Periódico |
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