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Preliminary studies of the Raman spectra of hbox {Ag}_{2}hbox {Te}hbox { and }hbox {Ag}_{5}hbox {Te}_{3} |
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| Authors: | T. I. Milenov T. Tenev I. Miloushev G. V. Avdeev C. W. Luo W. C. Chou |
| Affiliation: | 1. “E. Djakov” Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784?, Sofia, Bulgaria 2. “G. Nadjakov” Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784?, Sofia, Bulgaria 3. “R. Kaishev” Institute of Physical Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 11, 1113?, Sofia, Bulgaria 4. Department of Electrophysics, National Chiao Tung University, No 1001, Ta Hsueh Rd, Hsinchu?, 300, Taiwan |
| 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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