论文标题
直接观察Moiré超级晶格中的不同迷你班
Direct observation of distinct minibands in moiré superlattices
论文作者
论文摘要
由堆叠的二维材料组成的Moiré超级晶格提出了一个多功能平台，用于工程和研究新的新兴物质量子状态。目前，绝大多数研究的系统具有很长的Moiré波长，但是在较短的，不超高的波长和较高能量尺度下研究这些效果仍然是一个挑战。在这里，我们采用具有亚微米空间分辨率的角度分辨光发射光谱谱（ARPE）来研究一系列不同的Moiré超晶状体，这些超晶格跨越了较大的波长，从较短的Moiré波长为0.5 nm的短元素/WSE2（g/wse2）杂音构造的近距离杂物，到heterostruenture的杂音长度为8 nm，均为8 nm的长度。我们观察到由Moiré潜力在两个系统中形成的不同分散体的小型班的形成。最后，我们发现WS2/WSE2异质结构可以在第三个单独的石墨烯（G/WS2/WSE2）上烙印出令人惊讶的巨大潜力，这表明在二维材料中为工程Moiré超级晶格设计了新的途径。
Moiré superlattices comprised of stacked two-dimensional materials present a versatile platform for engineering and investigating new emergent quantum states of matter. At present, the vast majority of investigated systems have long moiré wavelengths, but investigating these effects at shorter, incommensurate wavelengths, and at higher energy scales, remains a challenge. Here, we employ angle-resolved photoemission spectroscopy (ARPES) with sub-micron spatial resolution to investigate a series of different moiré superlattices which span a wide range of wavelengths, from a short moiré wavelength of 0.5 nm for a graphene/WSe2 (g/WSe2) heterostructure, to a much longer wavelength of 8 nm for a WS2/WSe2 heterostructure. We observe the formation of minibands with distinct dispersions formed by the moiré potential in both systems. Finally, we discover that the WS2/WSe2 heterostructure can imprint a surprisingly large moiré potential on a third, separate layer of graphene (g/WS2/WSe2), suggesting a new avenue for engineering moiré superlattices in two-dimensional materials.
