Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Dynamics in many-body systems: Equilibration and localization II (joint session DY/TT)

TT 20.9: Vortrag

Montag, 1. April 2019, 17:45–18:00, H19

Laser driven ultrafast crystallization of phase-change material Ge1Sb2Te4 — •Jingyi Zhu¹, Shuai Wei², Julian Merten², Christoph Persch², Lin Yang¹, Matthias Wuttig², and Paul H. M. van Loosdrecht¹ — ¹Physics institute 2, University of Cologne, 50937, Germany — ²I. Institute of Physics (IA), RWTH Aachen University, Aachen, 52074, Germany

Rapid and reversible switching between amorphous and crystalline phases of the phase-change materials are either used or very promising in a wide range of applications in the electronic, optoelectronic, and photonic memory devices. Here we use time-resolved spontaneous Raman spectra to monitor the ultrafast process of melting, bond softening and crystallization in the phase changing material Ge1Sb2Te4 upon laser excitation. We demonstrate ultrafast crystallization on a ps timescale by monitoring the transient formation of a well-defined phonon mode signaling the crystalline state emerging from a broad vibrational continuum typical for the amorphous state.