Photoinduced Rippling of Two-Dimensional Hexagonal Nitride Monolayers
Photoinduced Rippling of Two-Dimensional Hexagonal Nitride Monolayers
复制标题
二维六方氮化物单层膜的光致波纹
DOI：
10.1021/acs.nanolett.2c03238
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发表时间：
2022-11-07
期刊：
影响因子：
10.8
通讯作者：
Zhou，Jian
中科院分区：
文献类型：
--
作者：
Liu，Kun;Mao，Sheng;Zhou，Jian
使用非侵入性方法（例如超快激光技术）诱导结构变化和变形是多种光机械和光电应用的有吸引力的途径。在这里，我们展示了光子激发如何在二维（2D）材料中积累面内应力并诱导长波长波纹。基于第一性原理计算和连续介质模型的数值结果预测，在光子激发下，六方氮化物单原子片中可能出现长程纳米尺度的波纹。光致软化的横向声学模式占主导地位的平面外变形的片材，和由此产生的波纹图案强烈地依赖于边界条件。结果表明，涟漪尺度的波长和高度分别为I-1/3和I 1/6，其中I为入射光的能量通量。我们的研究结果基于多尺度理论和模拟阐明了载流子激发，声子色散和远程机械变形之间的相互作用，这可能会在柔性电子和机电设备中找到潜在的用途。
Inducing structural changes and deformation using noninvasive methods, such as ultrafast laser technology, is an attractive route to multiple optomechanical and optoelectronic applications. Here, we show how photon excitation could accumulate in-plane stress and induce long-wavelength ripples in two-dimensional (2D) materials. Numerical results based on first-principles calculations and a continuum model predict that long-range nanoscale rippling could emerge under photon excitation in hexagonal nitride single atomic sheets. The photosoftened transverse acoustic mode dominates the out-of-plane distortion of the sheet, and the resultant rippling pattern strongly depends on the boundary condition. We reveal that the wavelength and height of the ripple scale asI–1/3andI1/6, respectively, whereIis the incident light energy flux. Our findings based on multiscale theory and simulations elucidate the interplay between carrier excitation, phonon dispersion, and long-range mechanical deformations, which could find potential usage in flexible electronics and electromechanical devices.