Suppressing Electron–Phonon Coupling through Laser-Induced Phase Transition,ACS Applied Materials & Interfaces

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Suppressing Electron–Phonon Coupling through Laser-Induced Phase Transition
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-07-07 00:00:00 , DOI: 10.1021/acsami.7b05480
Zhaowu Wang _{1,

2,

3} , Xiyu Li ₂ , Guozhen Zhang ₂ , Yi Luo ₂ , Jun Jiang ₂

Affiliation

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.

中文翻译：

通过激光诱导的相变抑制电子-声子耦合

使用第一性原理计算，我们引入了一种激光诱导的相变策略，该策略可以抑制晶格中的电子-声子耦合。我们在先前的MoTe ₂和NaYF ₄晶体实验中解释了异常的不可逆相变。激光照射在2H-MoTe ₂和Hex NaYF _4中产生局部热量，促使原子向新的晶格重组。具有有效电子-声子耦合的重组随着自发产生的热量而继续，而1T'-MoTe ₂和亚稳立方NaYF ₄由于抑制了振动松弛，所以保持了相。长时间的激光处理会产生具有弱电子-声子耦合的相。这种不可逆转的转变保证了完整的转化，为选择性的材料改良打开了新的大门。

更新日期：2017-07-08

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