期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 19, 期 45, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/19/45/455209
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We propose that the driving force of the ultrafast crystalline-to-amorphous transition in phase-change memory alloys is caused by strained bonds existing in the (metastable) crystalline phase. For the prototypical example of Ge2Sb2Te5, we demonstrate that upon breaking of the longer Ge-Te bond by photoexcitation, a Ge ion is shot from an octahedral crystalline to a tetrahedral amorphous position by the uncompensated force of strained short bonds. Subsequent lattice relaxation stabilizes the tetrahedral surroundings of the Ge atoms and ensures the long-term stability of the optically induced phase.
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