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Proceedings Article

Ultrafast dynamics in topological insulators

[+] Author Affiliations
C. W. Luo, H.-J. Chen, H. J. Wang, S. A. Ku, K. H. Wu, T. M. Uen, J. Y. Juang, J.-Y. Lin, B. L. Young, T. Kobayashi

National Chiao Tung Univ. (Taiwan)

R. Sankar, F. C. Chou

National Taiwan Univ. (Taiwan)

H. Berger

Ecole Polytechnique Fédérale de Lausanne (Switzerland)

G. D. Gu

Brookhaven National Lab. (United States)

Proc. SPIE 8623, Ultrafast Phenomena and Nanophotonics XVII, 86230D (March 14, 2013); doi:10.1117/12.2001954
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From Conference Volume 8623

  • Ultrafast Phenomena and Nanophotonics XVII
  • Markus Betz; Abdulhakem Y. Elezzabi; Jin-Joo Song; Kong-Thon Tsen
  • San Francisco, California, USA | February 02, 2013

abstract

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 (A1g1). According to the red shift of A1g1 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. © (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

C. W. Luo ; H.-J. Chen ; H. J. Wang ; S. A. Ku ; K. H. Wu, et al.
" Ultrafast dynamics in topological insulators ", Proc. SPIE 8623, Ultrafast Phenomena and Nanophotonics XVII, 86230D (March 14, 2013); doi:10.1117/12.2001954; http://dx.doi.org/10.1117/12.2001954


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