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 1
Bonding orbital dynamics of Ge probed by time-resolved resonant X-ray scattering. (a) Ultrafast orbital dynamics of Ge in relation to the lattice disorder is investigated by fs tr-RXS using XFEL pulses. Valence electrons are photo-excited from tetrahedral bonding to antibonding states by the fs-IR laser (orange arrows) to modify the 4sp³ orbital configurations directly probed by Ge K-edge RXS. (b) Reciprocal space map (0 K L) shows Bragg reflections (open circles) and ATS (filled circles). (c) With the X-ray energy tuned to Ge K-edge (11.1095 keV), the sensitivity to 4sp³ valence orbitals is enhanced to detect the forbidden ATS reflection.

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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