Preliminary studies of the Raman spectra of Ag2 Te and Ag 5 Te3

T. I. Milenov*, T. Tenev, I. Miloushev, G. V. Avdeev, Chih-Wei Luo, Wu-Ching Chou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The theoretical calculations indicated that the monoclinic low-temperature phase of silver telluride (β -Ag2 Te) is a new binary topological insulator with highly anisotropic single Dirac cone surface. We obtained β -Ag2 Te crystal ingots containing few grains by the Bridgman method. We also deposited thin films of tellurium, Ag5 Te3 and (Te+Ag5 Te3) by thermal evaporation method. The Raman spectra of β -Ag2 Te, tellurium and Ag 5 Te3 were measured at three excitation wave lengths: 633, 515 and 488 nm. The Raman active modes of β -Ag2 Te, tellurium and Ag5 Te3 are situated at frequencies below 300 cm -1 while vibrations of other phases appear at higher frequencies.

Original languageEnglish
Pages (from-to)573-580
Number of pages8
JournalOptical and Quantum Electronics
Volume46
Issue number4
DOIs
StatePublished - Apr 2014

Keywords

  • Raman spectroscopy
  • Semiconductors
  • Single crystals
  • Thin films
  • BILBAO CRYSTALLOGRAPHIC SERVER
  • LATTICE-DYNAMICS

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