Spin orbit phenomena in graphene-based heterostructures
Mardi 6 avril 2021 14:00
- Duree : 1 heure
Lieu : VISIO-CONFERENCE : Zoom
Orateur : Williams SAVERO TORRES (ICN2, Barcelona)
Lien pour suivre par visioconférence : https://univ-grenoble-alpes-fr.zoom.us/j/91808901596?pwd=UWZ2cml2N1VBOEZBenk0d3RJek9rdz09
Résumé :
In the last years, van der Waals heterostructures have attracted an increasing attention due to their outstanding properties, resulting from combining different two dimensional materials in compact structures, that have led to the emergence of new phenomena not accesible in other platforms (1). Among them, graphene constitutes a promissing material for spintronics because it enables the transport of spin signals over larger distances compared to other systems (2). However, its low intrinsic spin-orbit coupling difficults spin signal manipulation, which has prevented the fast application of graphene for spintronic devices. In this seminar, I will describe two of our recent studies performed in graphene-based heterostructures, where we demonstrate that spin signals can be generated and manipulated by means of proximity effects induced by spin-orbit phenomena. In the first part, I will show how the imprinted spin texture in graphene interfaced with a transition metal dichalcogenide give rise to an anisotropic spin relaxation, where the spin lifetime for spins oriented out-of-plane is one order of magnitude larger than those oriented in-plane (3). In the second part, I will show how such proximity-induced effects can be used to generate spin signals in graphene that can also be controlled by electrical gatting with one of the highest efficiency reported to date at room temperature (4). These results provide the building blocks for development of ultra-compact devices made of two dimensional materials.
(1) W. Savero Torres et al. MRS Bulletin 45(5), 357-365, (2020)
(2) W. Savero Torres et al. 2D Mat. 4, 041008, (2017)
(3) L. A. Benítez, J.F. Sierra, W. Savero Torres et al. Nat. Phys. 14, 303-308, (2018)
(4) L. A. Benítez, W. Savero Torres et al. Nat. Mat. 19, 170-175, (2020)
Contact : equipe-seminaires-nano@listes.grenoble.cnrs.fr
Discipline évènement : (Physique)
Entité organisatrice : (CEA / IRIG)
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Entité organisatrice : (Institut Néel)
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Entité organisatrice : (LPMMC)
Nature évènement : (Séminaire)
Evènement répétitif : (Séminaire Nanoélectronique Quantique)
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