Magnetically and optically active edges in phosphorene nanoribbons

• 成果类型: Article
• 署名作者: Ashoka, Arjun; Clancy, Adam J.; Panjwani, Naitik A.; Cronin, Adam; Picco, Loren; Aw, Eva S. Y.; Popiel, Nicholas J. M.; Eaton, Alexander G.; Parton, Thomas G.; Shutt, Rebecca R. C.; Feldmann, Sascha; Carey, Remington; Macdonald, Thomas J.; Liu, Cheng; Severijnen, Marion E.; Kleuskens, Sandra; Muscarella, Loreta A.; Fischer, Felix R.; Barbosa de Aguiar, Hilton; Friend, Richard H.; Behrends, Jan; Christianen, Peter C. M.; Howard, Christopher A.; Pandya, Raj
• 署名单位: University of Cambridge; University of London; University College London; University of California System; University of California Berkeley; University of Bristol; University of London; University College London; University of Cambridge; Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne; Imperial College London; Imperial College London; University of London; University College London; Radboud University Nijmegen; AMOLF; Vrije Universiteit Amsterdam; University of California System; University of California Berkeley; United States Department of Energy (DOE); Lawrence Berkeley National Laboratory; United States Department of Energy (DOE); Lawrence Berkeley National Laboratory; Universite PSL; College de France; Ecole Normale Superieure (ENS); Centre National de la Recherche Scientifique (CNRS); Sorbonne Universite; University of Warwick
• 刊物名称: Nature
• ISSN/ISSBN: 0028-1444
• DOI: 10.1038/s41586-024-08563-x
• 发表日期: 2025-03-13
• 关键词: graphene nanoribbons; ferromagnetism; surface; ORDER

摘要

Nanoribbons, nanometre-wide strips of a two-dimensional material, are a unique system in condensed matter. They combine the exotic electronic structures of low-dimensional materials with an enhanced number of exposed edges, where phenomena including ultralong spin coherence times1,2, quantum confinement3 and topologically protected states4,5 can emerge. An exciting prospect for this material concept is the potential for both a tunable semiconducting electronic structure and magnetism along the nanoribbon edge, a key property for spin-based electronics such as (low-energy) non-volatile transistors6. Here we report the magnetic and semiconducting properties of phosphorene nanoribbons (PNRs). We demonstrate that at room temperature, films of PNRs show macroscopic magnetic properties arising from their edge, with internal fields of roughly 240 to 850 mT. In solution, a giant magnetic anisotropy enables the alignment of PNRs at sub-1-T fields. By leveraging this alignment effect, we discover that on photoexcitation, energy is rapidly funnelled to a state that is localized to the magnetic edge and coupled to a symmetry-forbidden edge phonon mode. Our results establish PNRs as a fascinating system for studying the interplay between magnetism and semiconducting ground states at room temperature and provide a stepping-stone towards using low-dimensional nanomaterials in quantum electronics.