课题组博士后郑海红、博士生李少菲同学在国际纳米权威期刊Nano Research上发表论文

        近日，课题组博士后郑海红、博士生李少菲同学在刘老师的指导下，以第一作者在国际纳米权威期刊《纳米研究》(Nano Research，影响因子10.269)上发表题为“Dynamic control of Moiré potential in twisted WS₂-WSe₂ heterostructures”(扭角WS₂/WSe₂异质结构中莫尔势的动态调制)的实验论文。

图：扭角WS₂/WSe₂异质结构中莫尔势的动态调制

      莫尔超晶格是由二维材料中的晶格失配或扭曲角形成的，可产生周期性莫尔势，导致能带结构发生强烈变化，从而产生新的量子现象。然而，莫尔超晶格结构原位动态变形调制的实验尚未报道。本文中我们使用金刚石砧座(DAC)演示了扭曲异质结构的动态局部变形，从而能够在室温下对扭曲的WS₂/WSe₂异质结构中的莫尔势进行原位动态调制。扭曲异质结构的变形增加了莫尔势，导致莫尔激子共振红移，观察到层内激子共振红移高达16.3 meV（小于1.1 GPa）。扭曲的WS₂/WSe₂异质结构的层间激子的蓝移显示了压力对激子的明显转变，这是由改变能带结构对光学性质的主要影响引起的。结合加压拉曼光谱的变化，进一步证明了DAC可以有效调节层间耦合。我们的结果为莫尔势的原位动态调制提供了一种有效的策略，为新型量子器件的开发提供了一个有前景的平台。

论文链接：https://link.springer.com/article/10.1007/s12274-022-4579-9

Comments:

• This research highlights the ability to dynamically control the Moiré potential in twisted WS₂-WSe₂ heterostructures. This is an important finding as it opens up the possibility of developing new devices for electronic applications, such as sensors and transistors, that take advantage of the unique properties of these heterostructures. By controlling the Moiré potential, researchers can tailor the properties of these materials to meet the specific requirements of a particular application, leading to improved device performance. Overall, this work represents a significant advance in the field of 2D materials and holds great promise for future technological advancements.