Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 28, Pages 23309-23313Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b05480
Keywords
phase transition; first-principle; laser irradiation; local heat; electron-phonon coupling
Funding
- MOST [2014CB848900]
- CAS [XDB01020000]
- NSFC [21633006, 21473166, 11404095]
- Hefei Science Center CAS [2016HSC-IU012]
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Using first-principle calculations, we introduced a strategy of laser induced phase transition that suppress electron-phonon couplings in crystal lattice. We explained unusual irreversible phase transitions in previous experiments on MoTe2 and NaYF4 crystals. Laser irradiations produced local heats in 2H-MoTe2 and Hex NaYF4, driving atom reorganizations toward new lattices. The reorganization with effective electron-phonon couplings continues with spontaneously generated heats, whereas a 1T'-MoTe2 and a metastable cubic NaYF4 phases were kept because of suppressed vibrational relaxations. Long time laser treatments create phases with weak electron-phonon couplings. Such irreversible transitions guarantee complete conversions, opening a new door to selective material modifications.
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