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Ultrafast phase change in Ge2Sb2Te5 induced by selective excitation of coherent phonons

Kotaro Makino, Junji Tominaga, and Muneaki Hase

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Abstract

We demonstrate ultrafast phase change from amorphous to crystalline state by selective excitation of coherent phonons in Ge2Sb2Te5. We have observed phonon frequency shift corresponding to the structural change within 270 fs after photoexcitation.

© 2010 Optical Society of America

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