Dispersion of Phonon Surface Polaritons in ZnGeP2: Anisotropy and Temperature Impacts

作者：Shportko K V^*; Otto A; Venger E F

来源：Nanoscale Research Letters, 2016, 11(1): 76.

DOI：10.1186/s11671-016-1270-7

• Single crystal
• Phonon
• Surface polariton
• Anisotropy
• Low temperature

Zinc germanium diphosphide (ZnGeP2) is an attractive and promising functional material for different devices of the nano-and optoelectronics. In this paper, dispersion of phonon surface polaritons (PSPs) in ZnGeP2 has been studied in the 200-500-cm(-1) spectral range at 4 and 300 K. Dispersion of "real" and "virtual" PSPs were calculated for C-axis being normal and parallel to the surface. Anisotropy in ZnGeP2 leads to the different numbers of PSP dispersion branches for different orientations of the sample. The temperature-dependent phonon contributions in the dielectric permittivity shift dispersion of the surface polaritons in ZnGeP2 to the higher wavenumbers at 4 K. We have shown that experimental dispersion of PSP is in agreement with theory.

• 出版日期2016-2-9