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We report the results of polarization-dependent Raman spectroscopy of phononstates in single-crystalline quasi-one-dimensional NbTe$_4$ and TaTe$_4$ vander Waals materials. The measurements were conducted in the wide temperaturerange from 80 K to 560 K. Our results show that although both materials haveidentical crystal structures and symmetries, there is a drastic difference inthe intensity of their Raman spectra. While TaTe4 exhibits well-defined peaksthrough the examined frequency and temperature ranges, NbTe4 reveals extremelyweak Raman signatures. The measured spectral positions of the phonon peaksagree with the phonon band structure calculated using the density-functionaltheory. We offer possible reasons for the in-tensity differences between thetwo van der Waals materials. Our results provide insights into the phononproperties of NbTe$_4$ and TaTe$_4$ van der Waals materials and indicate thepotential of Raman spectroscopy for studying charge-density-wave quantumcondensate phases.

Phonon States in NbTe$_4$ and TaTe$_4$ Quasi-One-Dimensional van der Waals Crystals