High-Pressure Effects in Low-Temperature Fundamental Optical Absorption and Photoluminescence of Glassy Semiconductors

Low-temperature anomalies and nanosized levels formation of self-organized structures in the non-crystalline solids of As(Ge)-S(Se) systems

“…Anomalous temperature behavior of changes in the fraction of atoms in soft atomic configurations 𝜕𝜎/𝜕𝑇 (Fig. 1) manifests itself in the temperature range (3÷30) К and correlates with the position of the frequency domain of the boson peak νbp of chalcogenide glasses [3,8,15]. The presence of a boson peak confirms the formation of nanoscale ordered structures in chalcogenide glasses [3,15].…”

“…1) manifests itself in the temperature range (3÷30) К and correlates with the position of the frequency domain of the boson peak νbp of chalcogenide glasses [3,8,15]. The presence of a boson peak confirms the formation of nanoscale ordered structures in chalcogenide glasses [3,15]. One of the variants of such an implementation is the formation through the processes of self-organization of soft atomic configurations of a fractal structure, which precisely realizes the minimum of energy dissipation [7,14].…”

“…In the region of low temperatures (T < 50 K), the behavior of a number of thermal properties (the heat capacity, the coefficient of thermal expansion, the velocity of sound propagation) for non-crystalline solids is different from the temperature characteristics of the crystalline compounds. The low-temperature anomalies of physical properties for non-crystalline solids are described at present on the basis of representations of two-level tunnel states and soft atomic configurations without a single interpretation of their microscopic nature [3][4][5]. An interesting application of such phenomena is also the Bose & Einstein condensation, which is being studied intensively studied over the past decades [6].…”