1D Flat Bands in Phosphorene Nanoribbons with Pentagonal Nature
Shuo Sun, Jing‐Yang You, Zhihao Cai, Jie Su, Tong Yang, Xinnan Peng, Yihe Wang, Daiyu Geng, Jian Gou, Yuli Huang, Sisheng Duan, Lan Chen, Kehui Wu, Andrew T. S. Wee, Yuan Ping Feng, Jia Lin Zhang, Jiong Lu, Baojie Feng, Wei ChenAbstract
Materials with flat bands can serve as a promising platform to investigate strongly interacting phenomena. However, experimental realization of ideal flat bands is mostly limited to artificial lattices or moiré systems. Here, a general way is reported to construct 1D flat bands in phosphorene nanoribbons (PNRs) with a pentagonal nature: penta‐hexa‐PNRs and penta‐dodeca‐PNRs, wherein the corresponding 1D flat bands are directly verified by using angle‐resolved photoemission spectroscopy. It is confirmed that the observed 1D flat bands originate from the electronic 1D zigzag and Lieb lattices, respectively, as revealed by the combination of bond‐resolved scanning tunneling microscopy, scanning tunneling spectroscopy, tight‐binding models, and first‐principles calculations. The study demonstrates a general way to construct 1D flat bands in 1D solid materials system, which provides a robust platform to explore strongly interacting phases of matter.