Elastic coefficients in TlGa(S1-xSex)2 and TlInxGa1-xS2 layer mixed crystal by Brillouin scattering

Electronic properties and phase transitions in low-dimensional semiconductors

“…This finding will be discussed below along with the band structure calculations. We note that the considerable interlayer and interchain overlap observed in the aforementioned compounds affects their physical properties, e.g., it reduces the anisotropy of the elastic coefficient in comparison to the layered semiconductors A III B VI [103]. As shown above, the twodimensional square lattice of TlSe in the (001) plane, with alternating univalent and trivalent ions, is not metallic at ambient temperature.…”

Low-Temperature Raman Scattering in TlGaxIn1-xS2Layered Mixed Crystals: Compositional Dependence of the Mode Frequencies and Line Shapes

“…The phonon spectra of TlGa x In 1−x S 2 mixed crystals at room temperature have been deduced previously from infrared reflection, Raman, and Brillouin scattering measurements [14][15][16]. In our previous paper we reported the frequency dependencies of the Raman-active modes on composition of TlGa x In 1−x S 2 mixed crystals at T = 300 K [14].…”

Optical properties of TlGaxIn1−xS2 layered mixed crystals (0≤x≤1) I. Composition- and temperature-tuned energy band gap

“…Previously, the structural and optical properties of the TlGa x In 1−x S 2 mixed crystals were investigated by X-ray diffraction [13], infrared reflection [14], photoluminescence [15], Raman [14] and Brillouin [16] spectroscopy. It was established that the phonon spectra of the mixed crystals exhibit the typical features of vibrational spectra of molecular crystals, namely the presence of low-frequency translational modes and highfrequency "intramolecular" modes.…”