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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