Resonance-enhanced excitation and relaxation dynamics of coherent phonons in Fe1.14Te

Ning Li, Chenhui Zhang, Weizheng Liang, Yaohua Jiang, Xi Xiang Zhang, Yang Mi*, Sheng Nian Luo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Lattice dynamics plays a significant role in manipulating the unique physical properties of materials. In this work, femtosecond transient optical spectroscopy is used to investigate the generation mechanism and relaxation dynamics of coherent phonons in Fe1.14Te—a parent compound of chalcogenide superconductors. The reflectivity time series consist of the exponential decay component due to hot carriers and damped oscillations caused by the A1g phonon vibration. The vibrational frequency and dephasing time of the A1g phonons are obtained as a function of temperature. With increasing temperature, the phonon frequency decreases and can be well described with the anharmonicity model. Dephasing time is independent of temperature, indicating that the phonon dephasing is dominated by phonon-defect scattering. The impulsive stimulated Raman scattering mechanism is responsible for the coherent phonon generation. Owing to the resonance Raman effect, the maximum photosusceptibility of the A1g phonons occurs at 1.590 eV, corresponding to an electronic transition in Fe1.14Te.

Original languageEnglish (US)
Pages (from-to)28941-28947
Number of pages7
JournalPhysical Chemistry Chemical Physics
Issue number42
StatePublished - Oct 6 2023

Bibliographical note

Publisher Copyright:
© 2023 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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