Vibrational properties of epitaxial Bi4Te3 films as studied by Raman spectroscopy

Hao Xu, Yuxin Song, Wenwu Pan, Qimiao Chen, Xiaoyan Wu, Pengfei Lu, Qian Gong, Shumin Wang

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Bi4Te3, as one of the phases of the binary Bi-Te system, shares many similarities with Bi2Te3, which is known as a topological insulator and thermoelectric material. We report the micro-Raman spectroscopy study of 50 nm Bi4Te3 films on Si substrates prepared by molecular beam epitaxy. Raman spectra of Bi4Te3 films completely resolve the six predicted Raman-active phonon modes for the first time. Structural features and Raman tensors of Bi4Te3 films are introduced. According to the wavenumbers and assignments of the six eigenpeaks in the Raman spectra of Bi4Te3 films, it is found that the Raman-active phonon oscillations in Bi4Te3 films exhibit the vibrational properties of those in both Bi and Bi2Te3 films.
Original languageEnglish
Pages (from-to)87103
JournalAIP Advances
Volume5
Issue number8
DOIs
Publication statusPublished - 1 Aug 2015
Externally publishedYes

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