Probing spatial phonon correlation length in post-transition metal monochalcogenide GaS using Tip-Enhanced Raman Spectroscopy
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Universidade Federal de Minas Gerais
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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.
Abstract
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Fônons, Nanomateriais, Espectroscopia de Raman
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TERS, GaS, Nanomateriais, Tip-Enhanced Raman Spectroscopy, Phonon coherence length, Spatial correlation length
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https://pubs.acs.org/doi/10.1021/acs.nanolett.9b02974