Temperature dependence of Raman-active optical phonons in Bi_2Se_3 and Sb_2Te_3

A. L. Lima Sharma; D. Smirnov; I. Miotkowski; J. Shi; M. A. Hekmaty; P. A. Sharma; X. Chen; Y. Kim; Y. P. Chen; Z. Jiang

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Temperature dependence of Raman-active optical phonons in Bi₂Se₃ and Sb₂Te₃

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arxiv 1112.1364 v1 pith:CZ2KAN3E submitted 2011-12-06 cond-mat.mtrl-sci cond-mat.mes-hall

Temperature dependence of Raman-active optical phonons in Bi₂Se₃ and Sb₂Te₃

Y. Kim , X. Chen , Z. Wang , J. Shi , I. Miotkowski , Y. P. Chen , P. A. Sharma , A. L. Lima Sharma

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M. A. Hekmaty Z. Jiang D. Smirnov

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classification cond-mat.mtrl-sci cond-mat.mes-hall

keywords temperaturedependencephononsopticalrangeanalyzedanharmonicbeen

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Inelastic light scattering spectra of Bi_2Se_3 and Sb_2Te_3 single crystals have been measured over the temperature range from 5 K to 300 K. The temperature dependence of dominant A^{2}_{1g} phonons shows similar behavior in both materials. The temperature dependence of the peak position and linewidth is analyzed considering the anharmonic decay of optical phonons and the material thermal expansion. This work suggests that Raman spectroscopy can be used for thermometry in Bi_2Se_3- and Sb_2Te_3-based devices in a wide temperature range.

Temperature dependence of Raman-active optical phonons in Bi₂Se₃ and Sb₂Te₃

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