Generation of coherent phonons in bismuth by ultrashort laser pulses in the visible and NIR: displacive versus impulsive excitation mechanism

Abstract

We have applied femtosecond pump-probe technique with variable pump wavelength to study coherent lattice dynamics in Bi single crystal. Comparison of the coherent amplitude as a function of pump photon energy for two different in symmetry Eg and A1g phonon modes with respective spontaneous resonance Raman profiles reveals that their generation mechanisms are quite distinct. We show that displacive excitation, which is the main mechanism for the generation of coherent A1g phonons, cannot be reduced to the Raman scattering responsible for the generation of lower symmetry coherent lattice modes

arXiv comment11 pages, 8 figures. This paper is accepted for publication in Physics Letters A

Cited by in corpus (9)

• Coherent Helicity-Dependent Spin-Phonon Oscillations in the Ferromagnetic van der Waals Crystal CrI3
• Polarization dependence of coherent phonon generation and detection in the 3D topological insulator Bi2Te3
• Signatures of ultrafast reversal of excitonic order in Ta${}_2$NiSe${}_5$
• Unveiling the underlying interactions in Ta2NiSe5 from photo-induced lifetime change
• Fano Interference at the Excitation of Coherent Phonons: Relation between the Asymmetry Parameter and the Initial Phase of Coherent Oscillations
• Ultrafast broadband optical spectroscopy for quantifying subpicometric coherent atomic displacements in $WT{e}_2$
• Excitation of coherent optical phonons in iron garnet by femtosecond laser pulses
• Identification of soft modes across the commensurate-to-incommensurate charge density wave transition in 1$T$-TaSe${}_2$
• Terahertz-induced tunnel ionization drives coherent Raman-active phonon in Bismuth