Ultrafast Switching of Sliding Polarization and Dynamical Magnetic Field in van der Waals Bilayers Induced by Light,Physical Review Letters

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Ultrafast Switching of Sliding Polarization and Dynamical Magnetic Field in van der Waals Bilayers Induced by Light
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-09-17 , DOI: 10.1103/physrevlett.133.126801
Jian Wang ₁ , Xu Li ₁ , Xingyue Ma ₁ , Lan Chen _{1,

2} , Jun-Ming Liu ₁ , Chun-Gang Duan _{3,

4} , Jorge Íñiguez-González _{5,

6} , Di Wu ₁ , Yurong Yang ₁

Affiliation

Sliding ferroelectricity is a unique type of polarity recently observed in van der Waals bilayers with a suitable stacking. However, electric-field control of sliding ferroelectricity is hard and could induce large coercive electric fields and serious leakage currents that corrode the ferroelectricity and electronic properties, which are essential for modern two-dimensional electronics and optoelectronics. Here, we proposed laser-pulse deterministic control of sliding polarization in bilayer hexagonal boron nitride by first principles and molecular dynamics simulation with machine-learned force fields. The laser pulses excite shear modes that exhibit certain directional movements of lateral sliding between bilayers. The vibration of excited modes under laser pulses is predicted to overcome the energy barrier and achieve the switching of sliding polarization. Furthermore, it is found that three possible sliding transitions—between AB (BA) and BA (AB) stacking—can lead to the occurrence of dynamical magnetic fields along three different directions. Remarkably, the magnetic fields are generated by the simple linear motion of nonmagnetic species, without any need for more exotic (circular, spiral) pathways. Such predictions of deterministic control of sliding polarization and multistates of dynamical magnetic field thus expand the potential applications of sliding ferroelectricity in memory and electronic devices.

中文翻译：

光诱导范德华双层中滑动偏振和动态磁场的超快切换

滑动铁电性是最近在具有适当堆叠的范德华双层中观察到的一种独特的极性类型。然而，滑动铁电体的电场控制很困难，并且可能会产生大的矫顽电场和严重的漏电流，从而腐蚀铁电体和电子性能，而这对于现代二维电子学和光电子学至关重要。在这里，我们提出了通过第一原理和机器学习力场的分子动力学模拟对双层六方氮化硼中滑动偏振的激光脉冲确定性控制。激光脉冲激发剪切模式，表现出双层之间横向滑动的某些方向运动。预计激光脉冲下激发模的振动将克服能量势垒并实现滑动偏振的切换。此外，我们还发现，AB (BA) 和 BA (AB) 堆叠之间的三种可能的滑动过渡可以导致沿三个不同方向出现动态磁场。值得注意的是，磁场是由非磁性物质的简单线性运动产生的，不需要更奇特的（圆形、螺旋）路径。这种对滑动极化和动态磁场多态的确定性控制的预测扩展了滑动铁电在存储器和电子设备中的潜在应用。

更新日期：2024-09-17

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