Ultrafast dynamics in topological insulators

Chih-Wei Luo, H. J. Chen, H. J. Wang, S. A. Ku, Kaung-Hsiung Wu, T. M. Uen, Jenh-Yih Juang, Jiunn-Yuan Lin, Ben-Li Young, T. Kobayashi, R. Sankar, F. C. Chou, H. Berger, G. D. Gu

研究成果: Conference contribution同行評審

5 引文 斯高帕斯(Scopus)


Ultrafast dynamics of carriers and phonons in topological insulators CuxBi2Se3-y (x=0, 0.1, 0.125, y=0, 1) was studied using femtosecond optical pump-probe spectroscopy. One damped oscillation was clearly observed in the transient reflectivity changes (ΔR/R), which is assigned to the coherent optical phonon (A1g 1). According to the red shift of A1g 1 phonon frequency, the Cu atoms in CuxBi2Se3 crystals may predominantly intercalated between pair of the quintuple layers. Moreover, the carrier dynamics in the Dirac-cone surface state is significantly different from that in bulk state, which was investigated using optical pump mid-infrared (mid-IR) probe spectroscopy. The rising time and decay time of the negative component in ΔR/R, which is assigned to carrier relaxation in Dirac cone, is 1.62 ps and 20.5 ps, respectively.

主出版物標題Ultrafast Phenomena and Nanophotonics XVII
出版狀態Published - 30 5月 2013
事件Ultrafast Phenomena and Nanophotonics XVII - San Francisco, CA, United States
持續時間: 3 2月 20136 2月 2013


名字Proceedings of SPIE - The International Society for Optical Engineering


ConferenceUltrafast Phenomena and Nanophotonics XVII
國家/地區United States
城市San Francisco, CA


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