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Raman spectroscopy of epitaxial topological insulator Bi2Te3 thin films on GaN substrates

H. Xu ; Y. X. Song ; Q. Gong ; W. W. Pan ; X. Y. Wu ; Shumin Wang (Institutionen för mikroteknologi och nanovetenskap, Fotonik)
Modern Physics Letters B (0217-9849). Vol. 29 (2015), 15,
[Artikel, refereegranskad vetenskaplig]

Bi2Te3 has drawn great attention in recent years as both a topological insulator and the best thermoelectric material at room temperature. We report on Raman spectroscopic study on Bi2Te3 thin films with thicknesses of 20-50 nm grown on GaN by molecular beam epitaxy. All the four classical optical phonon modes are clearly revealed for the first time in ex situ Raman for epitaxial Bi2Te3. Unusual and infrared-active vibration modes are also observed and analyzed. In the resonant Raman measurements, abnormal enhancement and suppression of different modes are studied. The interface modes caused by a large density of domain boundaries formed during coalescence of crystal islands with different lattice orientations and the Frohlich electron-phonon interaction are found to play significant roles during the Raman scattering processes.

Nyckelord: Topological insulator, Bi2Te3, Raman spectroscopy, resonant Raman scattering, domain boundaries, electron-phonon interaction

Denna post skapades 2015-07-06.
CPL Pubid: 219505


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Institutionen för mikroteknologi och nanovetenskap, Fotonik



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