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Statut |
Confirmé |
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Série |
LPENS-MDQ |
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Domaines |
cond-mat |
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Date |
Lundi 30 Mai 2022 |
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Heure |
13:30 |
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Institut |
LPENS |
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Salle |
Salle Dussane - 45 rue d'Ulm |
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Nom de l'orateur |
Pandya |
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Prenom de l'orateur |
Raj |
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Addresse email de l'orateur |
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Institution de l'orateur |
University of Cambridge, Laboratoire Kastler Brossel |
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Titre |
Optically-Active Magnetic Edge-States in Phosphorene Nanoribbons |
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Résumé |
Room-temperature ferromagnetic semiconductors offer a viable route to non-volatile digital
logic where states can be held without the help of an external driving voltage, drastically
lowering the power consumption of electronic circuits [1]. Thus far the search for
semiconducting ferromagnets has been dominated by magnetically doped semiconductors
where the semiconducting and magnetic properties often exist independently and if coupled,
only at low temperatures. Two-dimensional (2D) nanomaterials – particularly in their few to
monolayer limit – offer a potentially different route to semiconducting ferromagnetism due to
their unique electronic structures [2].
In this talk I will discuss our discovery of the existence of strong room-temperature
ferromagnetic correlations along the zigzag edge of semiconducting phosphorene
nanoribbons (zPNRs) [3]. I will demonstrate how we can map the magnetic phase diagram of
zPNRs to evidence Curie temperature in excess of 350 K and signatures of an
antiferromagnetic phase transition at 70 K. By manipulating the ribbon orientation using sub-
1T fields I will further discuss how the ultrafast dipolar dynamics of both in- and out-of-plane
excited state electronic transitions can be tracked and the importance of specific phonon
modes in controlling magnetism in low dimensions. If time allows, I will briefly show case
new methods we are developing to image carrier dynamics in layered materials.
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Numéro de preprint arXiv |
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Commentaires |
[1] Ando, Science 312, pp. 1883-1885 (2006)
[2] Slota, et al. Nature 557, pp 691–695 (2018)
[3] Watts et al. Nature 568, pp 216–220 (2019) |
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Fichiers attachés |
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