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Chin. Phys. B, 2014, Vol. 23(8): 086301    DOI: 10.1088/1674-1056/23/8/086301
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

Study on lattice vibrational properties and Raman spectra of Bi2Te3 based on density-functional perturbation theory

Feng Song-Ke (冯松科), Li Shuang-Ming (李双明), Fu Heng-Zhi (傅恒志)
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University (NPU), Xi'an 710072, China
Abstract  We present a variational density-functional perturbation theory (DFPT) to investigate the lattice dynamics and vibrational properties of single crystal bismuth telluride material. The phonon dispersion curves and phonon density of states (DOS) of the material were obtained. The phonon dispersions are divided into two fields by a phonon gap. In the lower field, atomic vibrations of both Bi and Te contribute to the DOS. In the higher field, most contributions come from Te atoms. The calculated Born effective charges and dielectric constants reveal a great anisotropy in the crystal. The largest Born effective charge generates a significant dynamic charge transferring along the c axis. By DFPT calculation, the greatest LO-TO splitting takes place in the infrared phonon modes and reaches 1.7 THz in the Brillouin zone center. The Raman spectra and peaks corresponding to respective atomic vibration modes were found to be in good agreement with the experimental data.
Keywords:  density-functional perturbation theory      Bi2Te3 material      lattice vibrational properties      Raman spectra  
Received:  08 August 2013      Revised:  02 April 2014      Accepted manuscript online: 
PACS:  63.20.-e (Phonons in crystal lattices)  
  63.20.D- (Phonon states and bands, normal modes, and phonon dispersion)  
  63.20.dk (First-principles theory)  
  78.30.-j (Infrared and Raman spectra)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 50971101 and 51074127) and the Research Fund of the State Key Laboratory of Solidification Processing (NPU) of China (Grant No. SKLSP201010).
Corresponding Authors:  Li Shuang-Ming     E-mail:  lsm@nwpu.edu.cn

Cite this article: 

Feng Song-Ke (冯松科), Li Shuang-Ming (李双明), Fu Heng-Zhi (傅恒志) Study on lattice vibrational properties and Raman spectra of Bi2Te3 based on density-functional perturbation theory 2014 Chin. Phys. B 23 086301

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