Phonon dynamics in Cu xBi 2Se 3 (x 0, 0.1, 0.125) and Bi 2Se 2 crystals studied using femtosecond spectroscopy

H. J. Chen*, Kaung-Hsiung Wu, Chih-Wei Luo, T. M. Uen, Jenh-Yih Juang, Jiunn-Yuan Lin, T. Kobayashi, H. D. Yang, R. Sankar, F. C. Chou, H. Berger, J. M. Liu

*Corresponding author for this work

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Abstract

Phonon dynamics in Bi, Bi 2Se 2, and Cu xBi 2Se 3 (x = 0, 0.1, 0.125) single crystals was investigated using femtosecond pump-probe spectroscopy. Two damped oscillations in measured transient reflectivity changes were observed, respectively, attributed to coherent optical and acoustic phonons. The frequency shift of the phonon modes in Bi-rich Bi 2Se 2 crystals indicates the intercalation of the additional Bi atoms into the Bi 2Se 3 matrix and formation of the Bi 2 layer between the quintuple layers (QLs). The deformation of QLs in Cu xBi 2Se 3 crystals was also found. These phonon dynamics results suggest that Cu atoms in Cu xBi 2Se 3 crystals are predominantly intercalated between pair of QLs.

Original languageEnglish
Article number121912
JournalApplied Physics Letters
Volume101
Issue number12
DOIs
StatePublished - 17 Sep 2012

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