Magnetically and optically active edges in phosphorene nanoribbons

Arjun Ashoka, Adam J. Clancy, Naitik A. Panjwani, Adam Cronin, Loren Picco, Eva S. Y. Aw, Nicholas J. M. Popiel, Alexander G. Eaton, Thomas G. Parton, Rebecca R. C. Shutt, Sascha Feldmann, Remington Carey, Thomas J. Macdonald, Cheng Liu, Marion E. Severijnen, Sandra Kleuskens, Loreta A. Muscarella, Felix R. Fischer, Hilton Barbosa de Aguiar, Richard H. Friend, Jan Behrends, Peter C. M. Christianen, Christopher A. Howard and Raj Pandya ()
Additional contact information
Arjun Ashoka: University of Cambridge
Adam J. Clancy: University College London
Naitik A. Panjwani: Freie Universität Berlin
Adam Cronin: Berkeley
Loren Picco: University of Bristol
Eva S. Y. Aw: University College London
Nicholas J. M. Popiel: University of Cambridge
Alexander G. Eaton: University of Cambridge
Thomas G. Parton: University of Cambridge
Rebecca R. C. Shutt: University College London
Sascha Feldmann: École Polytechnique Fédérale de Lausanne
Remington Carey: University of Cambridge
Thomas J. Macdonald: Imperial College London
Cheng Liu: University of Cambridge
Marion E. Severijnen: Radboud University
Sandra Kleuskens: Radboud University
Loreta A. Muscarella: AMOLF
Felix R. Fischer: Berkeley
Hilton Barbosa de Aguiar: Collège de France
Richard H. Friend: University of Cambridge
Jan Behrends: Freie Universität Berlin
Peter C. M. Christianen: Radboud University
Christopher A. Howard: University College London
Raj Pandya: University of Cambridge

Nature, 2025, vol. 639, issue 8054, 348-353

Abstract: Abstract 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.

Date: 2025
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DOI: 10.1038/s41586-024-08563-x

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