Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines cond-mat
Date Lundi 30 Mai 2022
Heure 13:30
Institut LPENS
Salle Salle Dussane - 45 rue d'Ulm
Nom de l'orateur Pandya
Prenom de l'orateur Raj
Addresse email de l'orateur
Institution de l'orateur University of Cambridge, Laboratoire Kastler Brossel
Titre Optically-Active Magnetic Edge-States in Phosphorene Nanoribbons
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.
Numéro de preprint arXiv
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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