Transient gap generation in BaFe$_2$As$_2$ driven by coherent lattice vibrations

Jacob A. Warshauer; Daniel Alejandro Bustamante Lopez; Qingxin Dong; Genfu Chen; Wanzheng Hu

doi:10.1093/pnasnexus/pgad164

Transient gap generation in BaFe$_2$As$_2$ driven by coherent lattice vibrations

Strongly Correlated Electrons 2023-06-22 v1 Materials Science Superconductivity

Authors: Jacob A. Warshauer , Daniel Alejandro Bustamante Lopez , Qingxin Dong , Genfu Chen , Wanzheng Hu

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Abstract

The electronic structure and the magnetic properties of iron-based superconductors are highly sensitive to the pnictogen height. Coherent excitation of the $A_{1g}$ phonon by femtosecond laser directly modulates the pnictogen height, which has been used to control the physical properties of iron-based superconductors. Previous studies show that the driven $A_{1g}$ phonon resulted in a transient increase of the pnictogen height in BaFe $_2$ As $_2$ , favoring an enhanced Fe magnetic moment. Here, we use time-resolved broadband terahertz spectroscopy to investigate the dynamics of BaFe $_2$ As $_2$ in the $A_{1g}$ phonon driven state. Below the spin-density wave (SDW) transition temperature, we observe a transient gap generation at early time delays. A similar transient feature is observed in the normal state up to room temperature.

Keywords

phonon physics iron-based superconductor phonon modes and lattice dynamics

Cite

@article{arxiv.2212.03337,
  title  = {Transient gap generation in BaFe$_2$As$_2$ driven by coherent lattice vibrations},
  author = {Jacob A. Warshauer and Daniel Alejandro Bustamante Lopez and Qingxin Dong and Genfu Chen and Wanzheng Hu},
  journal= {arXiv preprint arXiv:2212.03337},
  year   = {2023}
}

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6 pages, 4 figures

Transient gap generation in BaFe$_2$As$_2$ driven by coherent lattice vibrations

Abstract

Keywords

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