%0 Journal Article %1 WOS:000490353500082 %A Alencar, R S %A Rabelo, Cassiano %A Miranda, Hudson L S %A Vasconcelos, Thiago L %A Oliveira, Bruno S %A Ribeiro, Aroldo %A Publio, Bruno C %A Ribeiro-Soares, Jenaina %A Filho, A G Souza %A Cancado, Luiz Gustavo %A Jorio, Ado %C 1155 16TH ST, NW, WASHINGTON, DC 20036 USA %D 2019 %I AMER CHEMICAL SOC %J NANO LETTERS %K Raman coherence correlation length; length} phonon spatial spectroscopy; tip-enhanced {GaS; %N 10 %P 7357-7364 %R 10.1021/acs.nanolett.9b02974 %T Probing Spatial Phonon Correlation Length in Post-Transition Metal Monochalcogenide GaS Using Tip-Enhanced Raman Spectroscopy %V 19 %X 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 L-c of the A(1g)(1) and A(1g)(2) phonons of monolayer and few-layer gallium sulfide (GaS). The differences in L-c values are responsible for different enhancements of the A(1g) modes, with A(1g)(1) always enhancing more than the A(1g)(2), independently of the number of GaS layers. For five layers, the results show an L-c of 64 and 47 nm for A(1g)(1) and A(1g)(2), respectively, and the coherence lengths decrease when decreasing the number of layers, indicating that scattering with the surface roughness plays an important role.

@article{WOS:000490353500082, 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 L-c of the A(1g)(1) and A(1g)(2) phonons of monolayer and few-layer gallium sulfide (GaS). The differences in L-c values are responsible for different enhancements of the A(1g) modes, with A(1g)(1) always enhancing more than the A(1g)(2), independently of the number of GaS layers. For five layers, the results show an L-c of 64 and 47 nm for A(1g)(1) and A(1g)(2), respectively, and the coherence lengths decrease when decreasing the number of layers, indicating that scattering with the surface roughness plays an important role.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, author = {Alencar, R S and Rabelo, Cassiano and Miranda, Hudson L S and Vasconcelos, Thiago L and Oliveira, Bruno S and Ribeiro, Aroldo and Publio, Bruno C and Ribeiro-Soares, Jenaina and Filho, A G Souza and Cancado, Luiz Gustavo and Jorio, Ado}, biburl = {https://www.bibsonomy.org/bibtex/2cb7f3eb2627cab5fbfdbb74a83bbc91f/ppgfis_ufc_br}, doi = {10.1021/acs.nanolett.9b02974}, interhash = {a729f1d40aa56e46314a1d99cbbd660e}, intrahash = {cb7f3eb2627cab5fbfdbb74a83bbc91f}, issn = {1530-6984}, journal = {NANO LETTERS}, keywords = {Raman coherence correlation length; length} phonon spatial spectroscopy; tip-enhanced {GaS;}, number = 10, pages = {7357-7364}, publisher = {AMER CHEMICAL SOC}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Probing Spatial Phonon Correlation Length in Post-Transition Metal Monochalcogenide GaS Using Tip-Enhanced Raman Spectroscopy}, tppubtype = {article}, volume = 19, year = 2019 }