Anharmonicity of Bi2Se3 revealed by fs transient optical spectroscopy

被引：6
作者：
Liu, Qiya [1 ]
Shao, Ruihui [1 ]
Li, Ning [2 ,3 ]
Liang, Weizheng [2 ,3 ,4 ]
Yang, Xinsheng [1 ]
Luo, S. N. [2 ,3 ,4 ]
Zhao, Yong [1 ,5 ]
机构：
[1] Southwest Jiaotong Univ, Minist Educ, Superconduct & New Energy R&D Ctr, Key Lab Adv Technol Mat, Chengdu 610031, Sichuan, Peoples R China
[2] Southwest Jiaotong Univ, Key Lab Adv Technol Mat, Minist Educ, Chengdu 610031, Sichuan, Peoples R China
[3] Southwest Jiaotong Univ, Inst Mat Dynam, Chengdu 610031, Sichuan, Peoples R China
[4] Peac Inst Multiscale Sci, Chengdu 610031, Sichuan, Peoples R China
[5] Fujian Normal Univ, Coll Phys & Energy, Fujian 350117, Fujian, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2019年 / 115卷 / 20期
关键词：
RAMAN; PHONONS;
D O I：
10.1063/1.5131257
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We investigate the anharmonic effects in Bi2Se3 crystals using femtosecond transient optical spectroscopy at 5-280 K. The reflectivity time series consist of exponential decay due to hot carriers and decaying oscillations due to the A1g1 phonon vibration. Vibration frequency and dephasing time of this optical phonon mode are obtained as a function of temperature, decreasing with increasing temperature; both the red shift in frequency and the increased dephasing rate induced by heating can be well described using the anharmonicity model including lattice thermal expansion and phonon-phonon coupling.
引用
收藏
页数：4
相关论文
共 37 条
[1]  
Agrawal R, 2017, ACTA OPHTHALMOL, V95, pe597, DOI DOI 10.1103/PHYSREVB.95.094104
[2]  
[Anonymous], 2016, J DIGITAL INVESTIGAT, V18, pS3, DOI DOI 10.1088/1367-2630/18/1/015008
[3]  
[Anonymous], 2010, RESUSCITATION, V81, pe1, DOI DOI 10.1103/PHYSREVB.81.115208
[4]  
[Anonymous], 2018, MED BALTIMORE, V97, pe9654, DOI DOI 10.1103/PHYSREVB.97.214304
[5]   Thermal expansion coefficients of Bi2Se3 and Sb2Te3 crystals from 10 K to 270 K [J].
Chen, X. ;
Zhou, H. D. ;
Kiswandhi, A. ;
Miotkowski, I. ;
Chen, Y. P. ;
Sharma, P. A. ;
Sharma, A. L. Lima ;
Hekmaty, M. A. ;
Smirnov, D. ;
Jiang, Z. .
APPLIED PHYSICS LETTERS, 2011, 99 (26)
[6]   Phonons of single quintuple Bi2Te3 and Bi2Se3 films and bulk materials [J].
Cheng, Wei ;
Ren, Shang-Fen .
PHYSICAL REVIEW B, 2011, 83 (09)
[7]   Fingerprints of Inelastic Transport at the Surface of the Topological Insulator Bi2Se3: Role of Electron-Phonon Coupling [J].
Costache, M. V. ;
Neumann, I. ;
Sierra, J. F. ;
Marinova, V. ;
Gospodinov, M. M. ;
Roche, S. ;
Valenzuela, S. O. .
PHYSICAL REVIEW LETTERS, 2014, 112 (08)
[8]  
Delaire O, 2011, NAT MATER, V10, P614, DOI [10.1038/nmat3035, 10.1038/NMAT3035]
[9]   Pressure and temperature dependence of Raman spectra and their anharmonic effects in Bi2Se3 single crystal [J].
Deshpande, M. P. ;
Bhatt, Sandip V. ;
Sathe, Vasant ;
Rao, Rekha ;
Chaki, S. H. .
PHYSICA B-CONDENSED MATTER, 2014, 433 :72-78
[10]   Coherent lattice dynamics of the topological insulator Bi2Te3 probed by ultrafast spectroscopy [J].
Flock, J. ;
Dekorsy, T. ;
Misochko, O. V. .
APPLIED PHYSICS LETTERS, 2014, 105 (01)
1234