论文标题
Terahertz光学驱动的二维多乳腺驱动相变
Terahertz Optics Driven Phase Transition in Two-Dimensional Multiferroics
论文作者
论文摘要
在基于半导体的数据存储应用程序的快速开关速度中，位移性马氏体相变可能有望。除传统的相变材料外，最近发现的二维铁从材料由于其快速的铁反开关动力学而引起了很多关注，这可能会极大地提高数据存储密度并提高读/写入速度。在这项研究中，我们建议具有中间强度和选定频率的Terahertz激光器可以触发二维多表情中的铁色秩和转换，这是一种无损害的非接触方法。通过第一原理计算，我们在理论上和计算上研究了两个实验制造的多用量（具有铁弹性和铁电）材料的光学诱导的电子，语音和机械响应，\ b {eta} -gese-gese-gese和α-snte Monolayer。我们表明，可以通过Terahertz激光器的极化方向有效地操纵不同方向变体的相对稳定性，后者选择性地与横向光学声子模式有选择性地结合。从一个方向变体到另一个方向的过渡可能是无障碍的，这表明可以避免超快的过渡动力学，并且可以避免常规的成核增长相变过程。
Displacive martensitic phase transition is potentially promising in semiconductor based data storage applications with fast switching speed. In addition to traditional phase transition materials, the recently discovered two-dimensional ferroic materials are receiving lots of attention owing to their fast ferroic switching dynamics, which could tremendously boost data storage density and enhance read/write speed. In this study, we propose that a terahertz laser with an intermediate intensity and selected frequency can trigger ferroic order switching in two-dimensional multiferroics, which is a damage-free noncontacting approach. Through first-principles calculations, we theoretically and computationally investigate optically induced electronic, phononic, and mechanical responses of two experimentally fabricated multiferroic (with both ferroelastic and ferroelectric) materials, \b{eta}-GeSe and α-SnTe monolayer. We show that the relative stability of different orientation variants can be effectively manipulated via the polarization direction of the terahertz laser, which is selectively and strongly coupled with the transverse optical phonon modes. The transition from one orientation variant to another can be barrierless, indicating ultrafast transition kinetics and the conventional nucleation-growth phase transition process can be avoidable.
