Optomechanical control of stacking patterns of h-BN bilayer
Optomechanical control of stacking patterns of h-BN bilayer
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DOI：
10.1007/s12274-019-2500-y
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发表时间：
2019-08
期刊：
影响因子：
9.9
通讯作者：
Haowei Xu;Jian Zhou;Yifei Li;R. Jaramillo;Ju Li
中科院分区：
文献类型：
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作者：
Haowei Xu;Jian Zhou;Yifei Li;R. Jaramillo;Ju Li
少层二维（2D）材料通常具有不同的（亚）稳定堆叠模式，这些模式具有不同的电子和光学特性。受光镊的启发，我们表明，具有选定频率的激光可以通过耦合到滑移相关的介电响应来改变双层六方氮化硼（BBN）的广义堆垛层错能量景观。因此，BBN可以以可控的方式在其堆叠模式之间可逆、无障碍地切换。我们用简化的运动方程模拟堆叠过渡的动力学，并证明它发生在皮秒时间尺度。当一层 BBN 具有接近自由的表面边界条件时，BBN 可以长时间锁定在其亚稳态堆叠模式。如此快速、可逆且非易失性的转变使得 BBN 成为数据存储和光学相位掩模的潜在介质。
Few-layer two-dimensional (2D) materials usually have different (meta)-stable stacking patterns, which have distinct electronic and optical properties. Inspired by optical tweezers, we show that a laser with selected frequency can modify the generalized stacking-fault energy landscape of bilayer hexagonal boron nitride (BBN), by coupling to the slip-dependent dielectric response. Consequently, BBN can be reversibly and barrier-freely switched between its stacking patterns in a controllable way. We simulate the dynamics of the stacking transition with a simplified equation of motion and demonstrate that it happens at picosecond timescale. When one layer of BBN has a nearly-free surface boundary condition, BBN can be locked in its metastable stacking modes for a long time. Such a fast, reversible and non-volatile transition makes BBN a potential media for data storage and optical phase mask.