论文标题
光诱导的滑动过渡到范德华材料中的隐藏阶段
Photoinduced sliding transition into a hidden phase in van der Waals materials
论文作者
论文摘要
我们提出了一个通用方案，用于在分层材料中进行亚稳定性和激发引起的切换。专注于最小的双层堆栈，其中每一层由带有A和B sublattices的蜂窝状晶格组成，我们就图层的相对滑动绘制了能量景观。滑动会影响层间跳，这会导致粘结和反键带之间的分裂。当这种分裂很大时，AA和AB堆叠配置分别对应于全局和次级最小值，并且这些配置通过抗层滑动的屏障将它们隔开。虽然化学掺杂仅使这种障碍物变平，但从粘结到抗反键频带的强\ emph {photodoping}可以瞬时破坏全局最小值，并引起向AB堆叠构型的滑动运动，从而从平衡的绝缘子转换为几乎无差异的无稳定相位的相位。局部排斥相互作用增强了这种跳跃驱动的效果，从而增加了差距并促进了层间滑动。
We propose a generic scenario for metastability and excitation-induced switching in layered materials. Focusing on a minimal bilayer stack, where each layer consists of a honeycomb lattice with A and B sublattices, we map out the energy landscape with respect to the relative sliding of the layers. The sliding affects the interlayer hopping, which induces a splitting between bonding and anti-bonding bands. When this splitting is large, the AA and AB stacking configurations correspond to the global and secondary minima, respectively, and these configurations are separated by a barrier against layer-sliding. While chemical doping only flattens this barrier, strong \emph{photodoping} from bonding to antibonding bands can transiently destabilize the global minimum and induce a sliding motion toward the AB stacked configuration, thereby switching from an equilibrium insulator to a nearly gapless metastable phase. This hopping-driven effect is enhanced by local repulsive interactions, which increase the gap and facilitate the inter-layer sliding.
