Abstract
Polarization-dependent absorption measurements of ${\mathrm{ReS}}_{2}$ and ${\mathrm{ReSe}}_{2}$ single crystals have been carried out in the temperature range between 25 and 500 K. A significant shift towards lower energies has been observed in the transmittance spectra of $\mathbf{E}\ensuremath{\parallel}\mathbf{b}$ polarization with respect to those corresponding to $\mathbf{E}\ensuremath{\perp}\mathbf{b}$ polarization. Analysis reveals that the absorption edges of ${\mathrm{ReS}}_{2}$ and ${\mathrm{ReSe}}_{2}$ are indirect allowed transitions. The parameters that describe the temperature dependence of the absorption edges with different polarizations in the van der Waals plane are evaluated. The results indicate that the electron-phonon coupling constants for $\mathbf{E}\ensuremath{\parallel}\mathbf{b}$ polarization are considerably larger than those of $\mathbf{E}\ensuremath{\perp}\mathbf{b}$ polarization.
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