Suppressing Electron–Phonon Coupling through Laser-Induced Phase Transition

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...

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Published inACS applied materials & interfaces Vol. 9; no. 28; pp. 23309 - 23313
Main Authors Wang, Zhaowu, Li, Xiyu, Zhang, Guozhen, Luo, Yi, Jiang, Jun
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 19.07.2017
Subjects
laser irradiation
electron−phonon coupling
local heat
phase transition
first-principle
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Summary: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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ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.7b05480