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

doi:10.1063/1.4754005

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

Research output: Contribution to journal › Article › peer-review

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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 language	English
Article number	121912
Journal	Applied Physics Letters
Volume	101
Issue number	12
DOIs	https://doi.org/10.1063/1.4754005
State	Published - 17 Sep 2012

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@article{467d3c0bdc6f464d863f43843afe7130,

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

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.",

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

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month = sep,

day = "17",

doi = "10.1063/1.4754005",

language = "English",

volume = "101",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

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TY - JOUR

T1 - Phonon dynamics in Cu xBi 2Se 3 (x 0, 0.1, 0.125) and Bi 2Se 2 crystals studied using femtosecond spectroscopy

AU - Chen, H. J.

AU - Wu, Kaung-Hsiung

AU - Luo, Chih-Wei

AU - Uen, T. M.

AU - Juang, Jenh-Yih

AU - Lin, Jiunn-Yuan

AU - Kobayashi, T.

AU - Yang, H. D.

AU - Sankar, R.

AU - Chou, F. C.

AU - Berger, H.

AU - Liu, J. M.

PY - 2012/9/17

Y1 - 2012/9/17

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84866872436&partnerID=8YFLogxK

U2 - 10.1063/1.4754005

DO - 10.1063/1.4754005

M3 - Article

AN - SCOPUS:84866872436

SN - 0003-6951

VL - 101

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 12

M1 - 121912

ER -

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

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