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Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 23: Ultrafast Electron Dynamics at Surfaces and Interfaces III

O 23.10: Vortrag

Dienstag, 19. März 2024, 12:45–13:00, MA 041

Sub-picosecond photo-induced local distortion reduction in Sb2Te chalcogenide phase-change material — •Zhipeng Huang1, Xinxin Cheng2, Hazem Daoud3, Wen-Xiong Song4, R. J. Dwayne Miller3, Klaus Sokolowski-Tinten1, and R. Kramer Campen11Faculty of Physics and Center of Nanointegration (CENIDE), University of Duisburg-Essen, Duisburg, Germany — 2SLAC National Accelerator Laboratory — 3Departments of Chemistry and Physics, University of Toronto — 4Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences

Chalcogenide phase-change materials can be switched reversibly between a low resistive opaque crystalline phase and a high resistive transparent amorphous phase by heating, electrical or optical pulses with (sub-)nanosecond switching speed. Femtosecond laser excitation provides an ultrafast, energy-efficient way for precisely manipulating the optical, electronic and structural properties of these materials.

Here we present our ultrafast electron diffraction and femtosecond-resolved sum frequency generation spectroscopy studies on Sb2Te material under femtosecond UV pulse irradiation. We observed a sub-picosecond photo-induced non-thermal structural change in the crystallized Sb2Te sample. Through careful structural factor calculations, we quantified the structural change corresponding to Sb/Te atom movement along the [111] plane to a less-distorted local structure by coupling to the A1g coherent optical phonon mode.

Keywords: Ultrafast electron diffraction; Non-linear spectroscopy; Structural dynamics

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