The nature of bosonic excitations in disordered materials has remained elusive due to the difficulties defining key concepts such as quasi-particles presence disorder. We report on experimental observation phonon-polaritons glasses, including a boson peak (BP), i.e. excess THz modes over Debye law. A theoretical framework based concept diffusons is developed model broadening linewidth polariton...

Molecular compounds of the general formula [(RT)4E6] (R=organic or organometallic substituent; T=C, Si, Ge, Sn; E=CH2, S, Se), hence adamantane derivatives and inorganic-organic hybrid based on a heteroadamantane structure exhibit non-linear optical response upon radiation with continuous-wave near-infrared laser. The effect depends compounds’ habitus, which itself elemental composition cluster...