论文标题
WSE2/WS2Moiré超级晶格中激子的相关绝缘子
Correlated insulator of excitons in WSe2/WS2 moiré superlattices
论文作者
论文摘要
在Moiré超级晶格中已经观察到了一系列非常规电子状态。但是，工程类似的骨骼相仍未开发。我们报告了WSE2/WS2Moiré超级晶格中的骨相关绝缘子的观察，该绝缘子由激子组成，即紧密结合的电子孔对。我们开发了一种泵探针光谱法，用于在激子填充ν_ex= 1和电荷中立性下观察激子不可压缩状态，表明具有抗激元的绝缘体。随着电荷密度的变化，骨相关的绝缘子在电荷填充ν_e= 1处连续过渡到电子相关的绝缘体，这表明这两个限制之间的混合相关的绝缘状态。我们的研究建立了半导体的Moiré超级晶格，作为工程玻感相的有趣平台。
A panoply of unconventional electronic states has been observed in moiré superlattices. Engineering similar bosonic phases remains, however, largely unexplored. We report the observation of a bosonic correlated insulator in WSe2/WS2 moiré superlattices composed of excitons, i.e., tightly bound electron-hole pairs. We develop a pump probe spectroscopy method that we use to observe an exciton incompressible state at exciton filling ν_ex = 1 and charge neutrality, indicating a correlated insulator of excitons. With varying charge density, the bosonic correlated insulator continuously transitions into an electron correlated insulator at charge filling ν_e = 1, suggesting a mixed correlated insulating state between the two limits. Our studies establish semiconducting moiré superlattices as an intriguing platform for engineering bosonic phases.
