Wu Wenjun, Sun Shuo, Tang Chi Sin, Wu Jing, Ma Yu, Zhang Lingfeng, Cai Chuanbing, Zhong Jianxin, Milošević Milorad V, Wee Andrew T S, Yin Xinmao
Department of Physics, Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University, Shanghai, 200444, China.
Singapore Synchrotron Light Source (SSLS), National University of Singapore, Singapore, 117603, Singapore.
Adv Mater. 2024 Oct;36(40):e2405615. doi: 10.1002/adma.202405615. Epub 2024 Aug 23.
Flat bands and Dirac cones in materials are the source of the exotic electronic and topological properties. The Lieb lattice is expected to host these electronic structures, arising from quantum destructive interference. Nevertheless, the experimental realization of a 2D Lieb lattice remained challenging to date due to its intrinsic structural instability. After computationally designing a Platinum-Phosphorus (Pt-P) Lieb lattice, it has successfully overcome its structural instability and synthesized on a gold substrate via molecular beam epitaxy. Low-temperature scanning tunneling microscopy and spectroscopy verify the Lieb lattice's morphology and electronic flat bands. Furthermore, topological Dirac edge states stemming from pronounced spin-orbit coupling induced by heavy Pt atoms are predicted. These findings convincingly open perspectives for creating metal-inorganic framework-based atomic lattices, offering prospects for strongly correlated phases interplayed with topology.
材料中的平带和狄拉克锥是奇异电子和拓扑性质的来源。预计利布晶格会承载这些由量子相消干涉产生的电子结构。然而，由于其固有的结构不稳定性，二维利布晶格的实验实现至今仍具有挑战性。在通过计算设计出铂 - 磷（Pt - P）利布晶格后，它成功克服了结构不稳定性，并通过分子束外延在金衬底上合成。低温扫描隧道显微镜和光谱学验证了利布晶格的形态和电子平带。此外，还预测了由重铂原子诱导的显著自旋 - 轨道耦合产生的拓扑狄拉克边缘态。这些发现令人信服地为创建基于金属 - 无机框架的原子晶格开辟了前景，为与拓扑相互作用的强关联相提供了前景。
