Swapping Exchange and Spin-Orbit Coupling in 2D van der Waals Heterostructures

Abstract

The concept of swapping the two most important spin interactions -- exchange and spin-orbit coupling -- is proposed based on two-dimensional multilayer van der Waals heterostructures. Specifically, we show by performing realistic ab initio simulations, that a single device consisting of a bilayer graphene sandwiched by a 2D ferromagnet Cr${}_2$Ge${}_2$Te${}_6$ (CGT) and a monolayer WS${}_2$, is able not only to generate, but also to swap the two interactions. The highly efficient swapping is enabled by the interplay of gate-dependent layer polarization in bilayer graphene and short-range spin-orbit and exchange proximity effects affecting only the layers in contact with the sandwiching materials. We call these structures ex-so-tic, for supplying either exchange (ex) or spin-orbit (so) coupling in a single device, by gating. Such bifunctional devices demonstrate the potential of van der Waals spintronics engineering using 2D crystal multilayers.

arXiv comment6 pages, 3 figures, 1 table + Supplemental Material

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Cited by in corpus (26)

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• Electrical control of valley-Zeeman spin-orbit coupling-induced spin precession at room temperature
• Transport spectroscopy of ultraclean tunable band gaps in bilayer graphene
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• Proximity effects in graphene on monolayers of transition-metal phosphorus trichalcogenides MPX${}_3$
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• Experimental observation of spin-split energy dispersion in high-mobility single-layer graphene/WSe2 heterostructures
• A seamless graphene spin valve based on proximity to van der Waals magnet Cr${}_2$Ge${}_2$Te${}_6$
• Towards fully two-dimensional spintronic devices
• Electrically Controllable van der Waals Antiferromagnetic Spin Valve
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• Giant Valley-Polarized Spin Splittings in Magnetized Janus Pt Dichalcogenides
• Tuning of Bilayer Graphene Heterostructure by Horizontally Incident Circular Polarized Light
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• Valley-Polarized Quantum Anomalous Hall Phase in Bilayer Graphene with Layer-Dependent Proximity Effects