Abstract
The theoretical calculations indicated that the monoclinic low-temperature phase of silver telluride \((\upbeta \hbox {-Ag}_{2}\hbox {Te})\) is a new binary topological insulator with highly anisotropic single Dirac cone surface. We obtained \(\upbeta \hbox {-Ag}_{2}\hbox {Te}\) crystal ingots containing few grains by the Bridgman method. We also deposited thin films of tellurium, \(\hbox {Ag}_{5}\hbox {Te}_{3}\hbox { and }(\hbox {Te+Ag}_{5}\hbox {Te}_{3})\) by thermal evaporation method. The Raman spectra of \(\upbeta \hbox {-Ag}_{2}\hbox {Te}\), tellurium and \(\hbox {Ag}_{5}\hbox {Te}_{3}\) were measured at three excitation wave lengths: 633, 515 and 488 nm. The Raman active modes of \(\upbeta \hbox {-Ag}_{2}\hbox {Te}\), tellurium and \(\hbox {Ag}_{5}\hbox {Te}_{3}\) are situated at frequencies below 300 \(\hbox {cm}^{-1}\) while vibrations of other phases appear at higher frequencies.
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Acknowledgments
The authors gratefully acknowledge Prof. M. Abrashev (Faculty of Physics, Sofia University, Sofia) for help with the Raman measurements. This work is financially sponsored by National Science Council of Taiwan (Grant No. NSC 98-2112-M-009-008-MY3) and is performed in the framework of COST Action MP 1204 of the EU.
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Milenov, T.I., Tenev, T., Miloushev, I. et al. Preliminary studies of the Raman spectra of \(\hbox {Ag}_{2}\hbox {Te}\hbox { and }\hbox {Ag}_{5}\hbox {Te}_{3}\) . Opt Quant Electron 46, 573–580 (2014). https://doi.org/10.1007/s11082-013-9810-1
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DOI: https://doi.org/10.1007/s11082-013-9810-1