覆盖层
材料科学
单层
薄脆饼
纳米尺度
光电子学
半导体
量子隧道
纳米技术
原子单位
六方氮化硼
纳米
凝聚态物理
石墨烯
物理
复合材料
量子力学
作者
Caleb Z. Zerger,Linsey K. Rodenbach,Yi-Ting Chen,Benjamin Safvati,Morgan Z. Brubaker,Steven Tran,Tse-An Chen,Mingyang Li,Lain‐Jong Li,David Goldhaber‐Gordon,Hari C. Manoharan
出处
期刊:Nano Letters
[American Chemical Society]
日期:2022-05-10
卷期号:22 (11): 4608-4615
被引量:2
标识
DOI:10.1021/acs.nanolett.1c04274
摘要
Monolayer hexagonal boron nitride (hBN) has attracted interest as an ultrathin tunnel barrier or environmental protection layer. Recently, wafer-scale hBN growth on Cu(111) was developed for semiconductor chip applications. For basic research and technology, understanding how hBN perturbs underlying electronically active layers is critical. Encouragingly, hBN/Cu(111) has been shown to preserve the Cu(111) surface state (SS), but it was unknown how tunneling into this SS through hBN varies spatially. Here, we demonstrate that the Cu(111) SS under wafer-scale hBN is homogeneous in energy and spectral weight over nanometer length scales and across atomic terraces. In contrast, a new spectral feature─not seen on bare Cu(111)─varies with atomic registry and shares the spatial periodicity of the hBN/Cu(111) moiré. This work demonstrates that, for some 2D electron systems, an hBN overlayer can act as a protective yet remarkably transparent window on fragile low-energy electronic structure below.
科研通智能强力驱动
Strongly Powered by AbleSci AI