Terahertz Driven Reversible Topological Phase Transition of Monolayer Transition Metal Dichalcogenides.
Terahertz Driven Reversible Topological Phase Transition of Monolayer Transition Metal Dichalcogenides.
复制标题
太赫兹驱动的单层过渡金属二硫属化物的可逆拓扑相变
DOI：
10.1002/advs.202003832
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发表时间：
2021-06
期刊：
影响因子：
--
通讯作者：
Li J
中科院分区：
文献类型：
--
作者：
Zhou J;Xu H;Shi Y;Li J
本文研究了太赫兹光如何驱动过渡金属二卤化物(TMD)的超快拓扑相变。这种相变是由光与材料中的电子和声子子系统相互作用引起的。用热力学理论解释了这种相变的机理：在光作用下可以有效地调制吉布斯自由能面貌，并且可以切换不同(亚)稳定相之间的相对稳定性。将这一机制应用于TMD，并预测了在适当的光频、偏振和强度下，拓扑平凡的2H相和非平凡的1T‘相之间的可逆相变。可以显著降低马氏体相变路径上的大能垒，从而产生小的能垒相变，且动力学速度快。与其他相变方案相比，光照明具有非接触性、易调谐等优点。可逆拓扑相变可应用于高分辨率的快速数据存储和内存计算设备。
This paper shows how terahertz light can drive ultrafast topological phase transitions in monolayer transition metal dichalcogenides (TMDs). The phase transition is induced by the light interaction with both electron and phonon subsystems in the material. The mechanism of such a phase transition is formulated by thermodynamics theory: the Gibbs free energy landscape can be effectively modulated under light, and the relative stability between different (meta‐)stable phases can be switched. This mechanism is applied to TMDs and reversible phase transitions between the topologically trivial 2H and nontrivial 1T′ phases are predicted, providing appropriate light frequency, polarization, and intensity are applied. The large energy barrier on the martensitic transformation path can be significantly reduced, yielding a small energy barrier phase transition with fast kinetics. Compared with other phase transition schemes, light illumination has great advantages, such as its non‐contact nature and easy tunability. The reversible topological phase transition can be applicable in high‐resolution fast data storage and in‐memory computing devices.
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