Fano Interference at the Excitation of Coherent Phonons: Relation between the Asymmetry Parameter and the Initial Phase of Coherent Oscillations

Abstract

The theoretical assertion that the Fano asymmetry parameter and the asymptotic initial phase of a harmonic oscillator interacting with a continuum are interrelated is experimentally verified. By an example of coherent fully symmetric A1g phonons in bismuth that are excited by ultrashort laser pulses at liquid helium temperature, it is demonstrated that, for negative values of the asymmetry parameter, the asymptotic phase increases as the modulus of the parameter decreases.

arXiv comment13 pages, 13 figures

References in corpus (3)

• Fano resonances in nanoscale structures
• Generation of coherent phonons in bismuth by ultrashort laser pulses in the visible and NIR: displacive versus impulsive excitation mechanism
• Photoinduced Fano-resonance of coherent phonons in zinc

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• Polaronic-Quasiparticle Picture for Generation Dynamics of Coherent Phonons in Semiconductors: Transient and Non-Linear Fano Resonance
• Localization of electronic states resulting from electronic topological transitions in the Mo${}_{1-x}$Re${}_x$ alloys: A photoemission study
• Ultrafast asymmetric Rosen-Zener-like coherent phonon responses observed in silicon