Phonon dynamics in CuxBi2Se3 (x=0, 0.1, 0.125) and Bi2Se2 crystals studied using femtosecond spectroscopy
Chen, H. -J.; Wu, K. H.; Luo, C. W.; Uen, T. M.; Juang, J. Y.; Lin, J. -Y.; Kobayashi, T.; Yang, H. -D.; Sankar, R.; Chou, F. C.; Berger, H.; Liu, J. M.
2012

Abstract

Phonon dynamics in Bi, Bi2Se2, and CuxBi2Se3 (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 Bi2Se2 crystals indicates the intercalation of the additional Bi atoms into the Bi2Se3 matrix and formation of the Bi-2 layer between the quintuple layers (QLs). The deformation of QLs in CuxBi2Se3 crystals was also found. These phonon dynamics results suggest that Cu atoms in CuxBi2Se3 crystals are predominantly intercalated between pair of QLs. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4754005]

Details

Title Phonon dynamics in CuxBi2Se3 (x=0, 0.1, 0.125) and Bi2Se2 crystals studied using femtosecond spectroscopy
Author(s) Chen, H. -J. ; Wu, K. H. ; Luo, C. W. ; Uen, T. M. ; Juang, J. Y. ; Lin, J. -Y. ; Kobayashi, T. ; Yang, H. -D. ; Sankar, R. ; Chou, F. C. ; Berger, H. ; Liu, J. M.
Published in Applied Physics Letters
Pagination 5
Volume 101
Issue 12
Pages 121912
Date 2012
Publisher Melville, Amer Inst Physics
ISSN 0003-6951
DOI https://doi.org/10.1063/1.4754005
Other identifier(s) View record in Web of Science
Laboratories ICMP
Record Appears in Scientific production and competences > SB - School of Basic Sciences > SB Archives > ICMP - IInstitute of Condensed Matter Physics
Peer-reviewed publications
Work produced at EPFL
Journal Articles
Published
Record creation date 2013-02-27

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