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Transient reflection spectra in topological nanocrystals of Bi2Se3, Bi2Te3, Bi2Te2Se

    Faizan Ahmad Rashmi Singh Rachana Kumar Mukesh Jewariya Chandra Shekhar Naresh Kumar Pramod Kumar

Advanced Materials Letters, 2017, Volume 8, Issue 4, Pages 423-427
10.5185/amlett.2017.6898

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Abstract

The wavelength and time delay dependent reflection spectra of nano crystals Bi2Se3, Bi­2Te3 and Bi­2Te2Se were studied for ultrafast dynamics, using pump and probe spectroscopy. We observed only one transient peak for Bi2Se3 below 600nm, which decreases linearly with time delay. Three transient sharp peaks were observed for Bi2Te3 for wavelength dependent graph, which reveals about the ultrafast dynamics of charge carrier. We also observed oscillations in Bi2Se3 crystal above 600 nm which was absent in Bi2Te3 sample.  Bi2Te2Se showed a single transient spectrum peak at 482 nm with the highest peak for 103ps time delay. The curve fitted Time resolve (TR) trace for both Bi2Se3 and Bi2Te3 crystals at 492 nm wavelength, revealed almost the same results for rise and decay time. 
Keywords:
    Ultrafast topological transient spectra femtosecond
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(2017). Transient reflection spectra in topological nanocrystals of Bi2Se3, Bi2Te3, Bi2Te2Se. Advanced Materials Letters, 8(4), 423-427. doi: 10.5185/amlett.2017.6898
Faizan Ahmad; Rashmi Singh; Rachana Kumar; Mukesh Jewariya; Chandra Shekhar; Naresh Kumar; Pramod Kumar. "Transient reflection spectra in topological nanocrystals of Bi2Se3, Bi2Te3, Bi2Te2Se". Advanced Materials Letters, 8, 4, 2017, 423-427. doi: 10.5185/amlett.2017.6898
(2017). 'Transient reflection spectra in topological nanocrystals of Bi2Se3, Bi2Te3, Bi2Te2Se', Advanced Materials Letters, 8(4), pp. 423-427. doi: 10.5185/amlett.2017.6898
Transient reflection spectra in topological nanocrystals of Bi2Se3, Bi2Te3, Bi2Te2Se. Advanced Materials Letters, 2017; 8(4): 423-427. doi: 10.5185/amlett.2017.6898
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