Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/40381
Title: Probing spatial phonon correlation length in post-transition metal Monochalcogenide GaS using tip-enhanced Raman spectroscopy
Keywords: GaS
Tip-enhanced Raman spectroscopy
Phonon coherence length
Spatial correlation length
Espectroscopia Raman
Comprimento de coerência
Correlação espacial
Issue Date: Aug-2019
Publisher: American Chemical Society
Citation: ALENCAR, R. S. et al. Probing spatial phonon correlation length in post-transition metal Monochalcogenide GaS using tip-enhanced Raman spectroscopy. Nano Letters, Washington, v. 19, n. 10, p. 7357-7364, Aug. 2019.
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 A1g1 and A1g2 phonons of monolayer and few-layer gallium sulfide (GaS). The differences in Lc values are responsible for different enhancements of the A1g modes, with A1g1 always enhancing more than the A1g2, independently of the number of GaS layers. For five layers, the results show an Lc of 64 and 47 nm for A1g1 and A1g2, respectively, and the coherence lengths decrease when decreasing the number of layers, indicating that scattering with the surface roughness plays an important role.
URI: https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.9b02974
http://repositorio.ufla.br/jspui/handle/1/40381
Appears in Collections:DFI - Artigos publicados em periódicos

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.