Pressure-Induced Dynamic Tuning of Interlayer Coupling in Twisted WSe2/WSe2 Homobilayers,Nano Letters

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Pressure-Induced Dynamic Tuning of Interlayer Coupling in Twisted WSe2/WSe2 Homobilayers
Nano Letters ( IF 9.6 ) Pub Date : 2023-09-19 , DOI: 10.1021/acs.nanolett.3c01640
Xing Xie _{1,

2} , Junnan Ding _{1,

2} , Biao Wu _{1,

2} , Haihong Zheng _{1,

2} , Shaofei Li ₁ , Chang-Tian Wang _{3,

4} , Jun He ₁ , Zongwen Liu _{5,

6} , Jian-Tao Wang _{3,

4,

7} , Yanping Liu _{1,

2,

8}

Affiliation

Moiré superlattices induced by twisted van der Waals (vdW) heterostructures or homostructures have recently gained significant attention due to their potential to generate exotic strong-correlation electronic and phonon phenomena. However, the lack of dynamic tuning for interlayer coupling of moiré superlattices hinders a thorough understanding and development of the moiré correlation state. Here, we present a dynamic tuning method for twisted WSe₂/WSe₂ homobilayers using a diamond anvil cell (DAC). We demonstrate the powerful tuning of interlayer coupling and observe an enhanced response to pressure for interlayer breathing modes and the rapid descent of indirect excitons in twisted WSe₂/WSe₂ homobilayers. Our findings indicate that the introduction of a moiré superlattice for WSe₂ bilayers gives rise to hybridized excitons, which lead to the different pressure-evolution exciton behaviors compared to natural WSe₂ bilayers. Our results provide a novel understanding of moiré physics and offer an effective method to tune interlayer coupling of moiré superlattices.

中文翻译：

扭曲 WSe2/WSe2 同层中层间耦合的压力诱导动态调节

由扭曲范德华（vdW）异质结构或同质结构引起的莫尔超晶格最近因其产生奇异的强相关电子和声子现象的潜力而受到广泛关注。然而，缺乏对莫尔超晶格层间耦合的动态调谐阻碍了对莫尔相关状态的彻底理解和发展。在这里，我们提出了一种使用金刚石砧池（DAC）的扭曲 WSe ₂ /WSe ₂同双层的动态调谐方法。我们展示了层间耦合的强大调节，并观察到层间呼吸模式对压力的增强响应以及扭曲的 WSe ₂ /WSe ₂同双层中间接激子的快速下降。_{我们的研究结果表明，WSe 2}双层中引入莫尔超晶格会产生杂化激子，与天然WSe ₂双层相比，这会导致不同的压力演化激子行为。我们的结果提供了对莫尔物理的新颖理解，并提供了一种调整莫尔超晶格层间耦合的有效方法。

更新日期：2023-09-19

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