Observing femtosecond orbital dynamics in ultrafast Ge melting with time-resolved resonant X-ray scattering

Lee, H.; Ahn, J.Y.; Chun, S.H.; Cho, D.H.; Sung, D.; Jung, C.; Shin, J.; Hwang, J.; Ha, S.S.; Jang, H.; Cho, B.-G.; Kim, S.; Park, J.; Nam, D.; Eom, I.; Shim, J.H.; Noh, D.Y.; Ihm, Y.; Song, C.

doi:10.1107/S2052252523007935

Figure 2
Temporal evolution of (0 0 6) orbital-sensitive and (0 0 4) Bragg reflections. (a) Diffraction intensities are compared for lattice (open circles) and orbital-sensitive reflections (filled circles) measured at an IR laser fluence of 45 mJ cm⁻². Intensity decay is commonly noted for a delay time longer than ∼10 ps. (b) The time-dependent diffraction intensity is enlarged for early delay time. The intensity of the orbital-sensitive reflection related to the dynamics of valence orbitals increases immediately after the laser illumination, while the lattice reflection remained constant until ∼7 ps. (c) The resonance energy profiles of the orbital-sensitive (0 0 6) reflection are compared for various delay times displaying the same resonance feature. Decreased intensity at 200 ps resulted from thermalized disorder of the crystal lattice.

IUCrJ

Volume 10| Part 6| November 2023| Pages 700-707

ISSN: 2052-2525

https://doi.org/10.1107/S2052252523007935

PHYSICS | FELS

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