Picosecond strain dynamics in Ge2Sb2Te5monitored by time-resolved x-ray diffraction

Paul Fons, Peter Rodenbach, Kirill V. Mitrofanov, Alexander V. Kolobov, Junji Tominaga, Roman Shayduk, Alessandro Giussani, Raffaella Calarco, Michael Hanke, Henning Riechert, Robert E. Simpson, Muneaki Hase

研究成果: Article査読

15 被引用数 (Scopus)

抄録

Coherent phonons (CPs) generated by laser pulses on the femtosecond scale have been proposed as a means to achieve ultrafast, nonthermal switching in phase-change materials such as Ge2Sb2Te5(GST). Here we use ultrafast optical pump pulses to induce coherent acoustic phonons and stroboscopically measure the corresponding lattice distortions in GST using 100-ps x-ray pulses from the European Synchrotron Radiation Facility (ESRF) storage ring. A linear-chain model provides a good description of the observed changes in the diffraction signal; however, the magnitudes of the measured shifts are too large to be explained by thermal effects alone, implying the presence of excited-state effects in addition to temperature-driven expansion. The information on the movement of atoms during the excitation process can lead to greater insight into the possibilities of using CP-induced phase transitions in GST.

本文言語English
論文番号094305
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
90
9
DOI
出版ステータスPublished - 2014 9月 25
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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