Abstract
Femtosecond laser pulses have been used to generate and detect fully symmetric (A 1g ) and doubly degenerate (E g ) coherent phonons in the topological insulator Bi2Te3. The isotropic detection of the low-symmetry E g modes has been obtained in the case of excitation in the near infrared range (λ = 1300 nm) and these modes have not been observed in the case of excitation with λ = 830 nm. The comparison of the amplitudes and initial phases of the coherent phonons indicates that the mechanisms of the excitation of fully symmetric (A 1g ) and doubly degenerate (E g ) modes in the topological insulator are different.
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Original Russian Text © O.V. Misochko, A.A. Mel’nikov, S.V. Chekalin, A.Yu. Bykov, 2015, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheckoi Fiziki, 2015, Vol. 102, No. 4, pp. 262–268.
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Misochko, O.V., Mel’nikov, A.A., Chekalin, S.V. et al. Features of coherent phonons of the strong topological insulator Bi2Te3 . Jetp Lett. 102, 235–241 (2015). https://doi.org/10.1134/S0021364015160080
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DOI: https://doi.org/10.1134/S0021364015160080