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Statut Confirmé
Domaines cond-mat
Date Lundi 8 Avril 2019
Heure 13:30
Institut LPENS
Salle Conf IV
Nom de l'orateur Zutic
Prenom de l'orateur Igor
Addresse email de l'orateur
Institution de l'orateur University at Buffalo, USA
Titre Proximitized Materials
Résumé Proximity effects can transform a given material through its adjacent regions to become superconducting, magnetic, or topologically nontrivial. In bulk materials, the sample size often greatly exceeds the characteristic lengths of proximity effects allowing their neglect. However, in 2D materials such as graphene, transition-metal dichalcogenides (TMDs) and 2D electron gas (2DEG), the situation is drastically different. Even short-range magnetic proximity effects exceed their thickness and strongly modify spin transport and optical properties. Experimental confirmation of our prediction for bias-controlled spin polarization reversal in Co/hBN/graphene suggests that magnetic proximity effects may overcome the need for an applied magnetic field and a magnetization reversal to implement spin logic. In TMDs, where robust excitons dominate their optical response, magnetic proximity effects cannot be described by the single-particle description. We predict a conversion between optically inactive and active excitons by rotating the magnetization of the substrate. Combined magnetic and superconducting proximity effects could enable elusive Majorana bounds states (MBS) for fault-tolerant quantum computing. Exchanging (braiding) MBS yields a noncommutative phase, a sign of non-Abelian statistics and nonlocal degrees of freedom protected from local perturbations. MBS could be manipulated and braided in proximity-induced superconductivity in a 2DEG with magnetic textures from the fringing fields of magnetic multilayers.
Numéro de preprint arXiv
Fichiers attachés
  • Seminaire-Zutic-08042019.pdf (117652 bytes) OPEN

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