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- W4311431625 abstract "Raman scattering (RS) in bulk hafnium disulfide (HfS$_2$) is investigated as a function of temperature (5 K $-$ 350 K) with polarization resolution and excitation of several laser energies. An unexpected temperature dependence of the energies of the main Raman-active (A$_{textrm{1g}}$ and E$_{textrm{g}}$) modes with the temperature-induced blueshift in the low-temperature limit is observed. The low-temperature quenching of a mode $omega_1$ (134 cm$^{-1}$) and the emergence of a new mode at approx. 184 cm$^{-1}$, labeled Z, is reported. The optical anisotropy of the RS in HfS$_2$ is also reported, which is highly susceptible to the excitation energy. The apparent quenching of the A$_{textrm{1g}}$ mode at $T$=5 K and of the E$_{textrm{g}}$ mode at $T$=300 K in the RS spectrum excited with 3.06~eV excitation is also observed. We discuss the results in the context of possible resonant character of light-phonon interactions. Analyzed is also a possible effect of the iodine molecules intercalated in the van der Waals gaps between neighboring HfS$_2$ layers, which inevitably result from the growth procedure." @default.
- W4311431625 created "2022-12-26" @default.
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- W4311431625 date "2022-12-12" @default.
- W4311431625 modified "2023-10-16" @default.
- W4311431625 title "The effect of temperature and excitation energy on Raman scattering in bulk HfS$_2$" @default.
- W4311431625 doi "https://doi.org/10.48550/arxiv.2212.05924" @default.
- W4311431625 hasPublicationYear "2022" @default.
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