Anisotropic terahertz optostriction in group-IV monochalcogenide compounds

Anisotropic terahertz optostriction in group-IV monochalcogenide compounds
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IV族单硫属化合物中的各向异性太赫兹光致伸缩

DOI:
10.1103/physrevb.105.195406
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发表时间:
2022-04
期刊:
影响因子:
3.7
通讯作者:
Zhou Jian
Zhou Jian
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Liu Kun;Zhou Jian

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太赫兹(THz)技术由于其对材料几何变化的敏感性和良好的透明度,是一种具有各种前景的前沿方案,如下一代电信,无损评估,安全检查和深入表征。尽管在过去的十年中已经取得了巨大的进展,但在微观上探索太赫兹物质相互作用的机制仍然处于起步阶段。在这项工作中,我们使用热力学理论来展示太赫兹照明如何使材料变形,并使用iv族单硫族化合物来说明这一点。根据我们的第一线原理密度泛函理论计算,中等强度(~109 W/cm2)的太赫兹光可以产生约0.1%的弹性变形,这取决于激光偏振方向。大的各向异性光力学响应也被揭示出来。最后,我们证明了这种应变可以通过测量探针光照射下的层分辨位移电流来检测。
Terahertz (THz) technology is a cutting-edge scheme with various promising applications, such as next generation telecommunication, non-destructive evaluation, security check, and in-depth characterization, owing to their sensitivity to material geometric change and good transparency. Even though tremendous progresses have been made during the past decade, exploration the mechanisms of THz-matter interaction microscopically is still in its infancy. In this work, we use thermodynamic theory to show how THz illumination deforms materials and use group-IV monochalcogenide compounds to illustrate it. According to our first-principles density functional theory calculations, THz light with intermediate intensity (~109 W/cm2) could yield elastic deformations on the order of ~0.1%, depending on laser polarization direction. Large anisotropic opto-mechanical responses are also revealed. Finally, we show that such strain can be detected via measuring the layer-resolved shift current under a probe light irradiation.
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