標題: Temperature-dependent carrier-phonon coupling in topological insulator Bi2Se3
作者: Lai, Yi-Ping
Chen, Hsueh-Ju
Wu, Kuang-Hsiung
Liu, Jia-Ming
電子物理學系
Department of Electrophysics
公開日期: 8-十二月-2014
摘要: Temperature-dependent (11.0K +/- 294.5 K) carrier-phonon coupling in Bi2Se3 is investigated by ultrafast pump-probe spectroscopy. The rise time of the differential reflectivity is interpreted by a combined effect of electron temperature relaxation and hot-phonon lifetime. The electron-phonon coupling constant of the bulk state (lambda = 0.63 +/- 0.05) is deduced from theoretical fitting. Increasing hot-phonon lifetime with decreasing temperature is attributed to a decreasing phonon-phonon collision rate. A complete analysis of the thermalization process is presented. Understanding carrier and phonon dynamics is essential for future optoelectronic and spintronic applications of topological insulators. (C) 2014 AIP Publishing LLC.
URI: http://dx.doi.org/10.1063/1.4904009
http://hdl.handle.net/11536/124076
ISSN: 0003-6951
DOI: 10.1063/1.4904009
期刊: APPLIED PHYSICS LETTERS
Volume: 105
Issue: 23
顯示於類別:期刊論文


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