A Density Function Investigation of Excited-State Effects due to Ultrafast Excitation in Ge2Sb2Te5 Epitaxial Films

Paul Fons; Paul Fons; Kirill Mitrofanov; Kirill Mitrofanov; Kotaro Makino; Ryo Terashima; Alexander V. Kolobov; Junji Tominaga; Alessandro Giussani; Raffella Calarco; Henning Riechert; Tetsuo Katayama; Takahiro Sato; Kanade Ogawa; Tadashi Togashi; Makina Yabashi; Muneaki Hase; Muneaki Hase; Muneaki Hase

doi:10.1364/JSAP.2014.17p_C4_6

JSAP-OSA Joint Symposia 2014 Abstracts
(Optica Publishing Group, 2014),
paper 17p_C4_6
•https://doi.org/10.1364/JSAP.2014.17p_C4_6

A Density Function Investigation of Excited-State Effects due to Ultrafast Excitation in Ge₂Sb₂Te₅ Epitaxial Films

Paul Fons, Kirill Mitrofanov, Kotaro Makino, Ryo Terashima, Alexander V. Kolobov, Junji Tominaga, Alessandro Giussani, Raffella Calarco, Henning Riechert, Tetsuo Katayama, Takahiro Sato, Kanade Ogawa, Tadashi Togashi, Makina Yabashi, and Muneaki Hase

JSAP-OSA Joint Symposia 2014

Sapporo, Hokkaido Japan
17–20 September 2014
ISBN: 978-4-86348-443-6

From the session
Laser Photonics—XFEL and ultrafast optics— (17p_C4)

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P. Fons, K. Mitrofanov, K. Makino, R. Terashima, A. V. Kolobov, J. Tominaga, A. Giussani, R. Calarco, H. Riechert, T. Katayama, T. Sato, K. Ogawa, T. Togashi, M. Yabashi, and M. Hase, "A Density Function Investigation of Excited-State Effects due to Ultrafast Excitation in Ge2Sb2Te5 Epitaxial Films," in JSAP-OSA Joint Symposia 2014 Abstracts, (Optica Publishing Group, 2014), paper 17p_C4_6.

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Abstract

As phase-change materials such as Ge2Sb2Te5 (GST) undergo dramatic changes in material properties due to a fundamentally local change in bonding behavior, the ultimate speed limits of the atomic switching process offer hope both for ultrafast switching as well as non-adiabatic energy efficient routes for memory applications [1, 2]. To this end, we have carried out experiments using the freeelectron laser SACLA to explore sub-picosecond lattice dynamics in epitaxial GST (111) in response to 30 fs optical pump excitation. The SACLA x-ray beam was used to probe the lattice dynamics using a symmetric diffraction geometry.

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