螺旋三层石墨烯中晶格弛豫与拓扑平带的原子尺度成像
Atomic-Scale Imaging of Lattice Relaxation and Topological Flat Bands in Helical Trilayer Graphene
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中文总结 AI 辅助
本研究通过扫描近场光学和低温扫描隧道显微镜，直接成像了螺旋三层石墨烯的超摩尔晶格弛豫，揭示了三角形和条状畴结构及畴壁边界态，并确定了约1.9°的魔角，建立了晶格弛豫与平带间的微观联系。
中文摘要 AI 辅助
螺旋三层石墨烯（HTG）已成为一种高度可调的摩尔量子材料，具有强电子关联和非平庸的能带拓扑。然而，其原子尺度的晶格结构和局域电子性质在很大程度上仍未被探索。在此，我们结合扫描近场光学显微镜和低温扫描隧道显微镜，对HTG进行了全面的实空间研究。我们直接成像了超摩尔晶格弛豫，揭示了由尖锐畴壁分隔的大三角形畴，以及由平滑变化边界连接的条状畴。原子尺度光谱揭示了具有蜂窝状电子织构的平带，以及局限于畴壁的一维边界态。通过系统改变扭转角，我们确定了一个约1.9°的魔角，显著大于理论预测的1.6°。我们的结果建立了HTG中晶格弛豫与平带之间的直接微观联系。
英文摘要
Helical trilayer graphene (HTG) has emerged as a highly tunable moire quantum material that hosts strong electronic correlations and nontrivial band topology. However, the atomic-scale lattice structure and local electronic properties have remained largely unexplored. Here we present a comprehensive real-space study of HTG using a combination of scanning near-field optical microscopy and low-temperature scanning tunneling microscopy. We directly image supermoire lattice relaxation, revealing large triangular domains separated by sharp domain walls, as well as stripe domains connected by smoothly varying boundaries. Atomic-scale spectroscopy uncovers flat bands with a honeycomb electronic texture and one-dimensional boundary states confined to domain walls. By systematically varying the twist angle, we identify a magic angle of approximately 1.9°, substantially larger than the 1.6 degree predicted by theory. Our results establish a direct microscopic link between lattice relaxation and flat bands in HTG.
发表机构
- National Institute for Materials Science（国立材料研究所）
- Hefei National Laboratory（合肥国家实验室）
- Shanghai Research Center for Quantum Sciences（上海量子科学研究中心）
- Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong)（粤港澳大湾区量子科学中心（广东））
- Southern University of Science and Technology（南方科技大学）
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