文献类型：期刊文献

英文题名：Topological Defects Induced High-Spin Quartet State in Truxene-Based Molecular Graphenoids

作者：Li, Can[1]; Liu, Yu[1]; Liu, Yufeng[1]; Xue, Fu-Hua[2]; Guan, Dandan[1,3,4]; Li, Yaoyi[1,3,4]; Zheng, Hao[1,3,4]; Liu, Canhua[1,3,4]; Jia, Jinfeng[1,3,4]; Liu, Pei-Nian[2]; Li, Deng-Yuan[2]; Wang, Shiyong[1,3,4]

机构：[1] Key Laboratory of Artificial Structures and Quantum Control [Ministry of Education], Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China; [2] Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai, 200237, China; [3] Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 200240, China; [4] Shanghai Research Center for Quantum Sciences, Shanghai, 201315, China

年份：2022

外文期刊名：arXiv

收录：EI(收录号：20220027043)

语种：英文

外文关键词：Atoms - Density functional theory - Ferromagnetic materials - Ferromagnetism - Graphene - Scanning probe microscopy - Scanning tunneling microscopy - Topology

摘要：Topological defects in graphene materials introduce exotic properties which are absent in their defect-free counterparts with both fundamental importance and technological implications. Although individual topological defects have been widely studied, collective magnetic behaviors originating from well-organized multiple topological defects remain a great challenge. Here, we studied the collective magnetic properties originating from three pentagon topological defects in truxene-based molecular graphenoids by using scanning tunneling microscopy and non-contact atomic force microscopy. Unpaired π electrons are introduced into the aromatic topology of truxene molecular graphenoids one by one by dissociating hydrogen atoms at the pentagon defects via atom manipulation. Scanning tunneling spectroscopy measurements together with density functional theory calculations suggest that the unpaired electrons are ferromagnetically coupled, forming a collective high-spin quartet state of S=3/2. Our work demonstrates that the collective spin ordering can be realized through engineering regular patterned topological defects in molecular graphenoids, providing a new platform for designer one-dimensional ferromagnetic spin chains and two-dimensional ferromagnetic networks. ? 2022, CC BY.