تقرير
Building spin-1/2 antiferromagnetic Heisenberg chains with diaza-nanographenes
| العنوان: | Building spin-1/2 antiferromagnetic Heisenberg chains with diaza-nanographenes |
|---|---|
| المؤلفون: | Fu, Xiaoshuai, Huang, Li, Liu, Kun, Henriques, João C. G., Gao, Yixuan, Han, Xianghe, Chen, Hui, Wang, Yan, Palma, Carlos-Andres, Cheng, Zhihai, Lin, Xiao, Du, Shixuan, Ma, Ji, Fernández-Rossier, Joaquín, Feng, Xinliang, Gao, Hong-Jun |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter Physics (Other) Quantum Physics |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics, Physics - Chemical Physics, Quantum Physics |
| الوصف: | Understanding and engineering the coupling of spins in nanomaterials is of central importance for designing novel devices. Graphene nanostructures with {\pi}-magnetism offer a chemically tunable platform to explore quantum magnetic interactions. However, realizing spin chains bearing controlled odd-even effects with suitable nanographene systems is challenging. Here, we demonstrate the successful on-surface synthesis of spin-1/2 antiferromagnetic Heisenberg chains with parity-dependent magnetization based on antiaromatic diaza-hexa-peri-hexabenzocoronene (diaza-HBC) units. Using distinct synthetic strategies, two types of spin chains with different terminals were synthesized, both exhibiting a robust odd-even effect on the spin coupling along the chain. Combined investigations using scanning tunneling microscopy, non-contact atomic force microscopy, density functional theory calculations, and quantum spin models confirmed the structures of the diaza-HBC chains and revealed their magnetic properties, which has an S = 1/2 spin per unit through electron donation from the diaza-HBC core to the Au(111) substrate. Gapped excitations were observed in even-numbered chains, while enhanced Kondo resonance emerged in odd-numbered units of odd-numbered chains due to the redistribution of the unpaired spin along the chain. Our findings provide an effective strategy to construct nanographene spin chains and unveil the odd-even effect in their magnetic properties, offering potential applications in nanoscale spintronics. |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2407.20511 |
| رقم الأكسشن: | edsarx.2407.20511 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |