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나노 구조 물리 연구단
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Phase-change like process through bond switching in distorted and resonantly bonded crystal

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Title
Phase-change like process through bond switching in distorted and resonantly bonded crystal
Author(s)
Won Jun Yang; Hanjin Park; Da Sol Kim; Taewoo Ha; Seung Jong Park; Min Ahn; Jae Hoon Kim; Young-Kyun Kwon; Mann-Ho Cho
Publication Date
2019-09
Journal
SCIENTIFIC REPORTS, v.9, no.1, pp.12816 -
Publisher
NATURE PUBLISHING GROUP
Abstract
© 2019, The Author(s).Although some methods to improve phase-change memory efficiency have been proposed, an effective experimental approach to induce a phase-change like process without external heat energy has not yet been reported. Herein we have shown that GeTe is a prototype phase-change material, which can exhibit a non-thermal phase-change-like process under uniaxial stress. Due to its structural characteristics like directional structural instability and resonance bonding under 1% uniaxial stress, we observed that bond switching in the GeTe film between short and long bonds is possible. Due to this phase change, GeTe displays the same phase-change as crystal layer rotation. Crystal layer rotation has not been observed in the conventional phase change process using intermediate states, but it is related to the structural characteristics required for maintaining local coordination. Moreover, since the resonance bonding characteristics are effectively turned off upon applying uniaxial stress, the high-frequency dielectric constant can be significantly decreased. Our results also show that the most significant process in the non-thermal phase transition of phase-change materials is the modulation of the lattice relaxation process after the initial perturbation, rather than the method inducing the perturbation itself. Finally, these consequences suggest that a new type of phase-change memory is possible through changes in the optical properties under stress
URI
https://pr.ibs.re.kr/handle/8788114/6437
ISSN
2045-2322
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
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