Abstract
Janus dichalcogenide multilayers provide a paradigmatic platform to engineer electronic phenomena dominated by spin–orbit coupling. Their unique spin–orbit effects stem from the mirror symmetry breaking in each layer, which induces a colossal Rashba spin–orbit effect in comparison with the conventional dichalcogenide counterparts. Here we put forward twisted Janus dichalcogenide bilayers as a simple platform to realize spin–orbit correlated states. We demonstrate the emergence of flat bands featuring strong spin-momentum locking and the emergence of symmetry broken states with associated non-coplanar magnetization when interactions are included. We further show that the symmetry broken states can be controlled by means of a magnetic substrate, strongly impacting the non-coplanar magnetic texture of the moire unit cell. Our results put forward twisted Janus multilayers as a powerful platform to explore spin–orbit correlated physics, and highlighting the versatility of magnetic substrates to control unconventional moire magnetism.
Highlights
Dichalcogenide van der Waals materials [1,2,3,4,5,6] are paradigmatic two dimensional compounds featuring strong spin–orbit coupling effects [7,8,9,10,11,12,13]
We demonstrate the emergence of flat bands featuring strong spin-momentum locking and the emergence of symmetry broken states with associated non-coplanar magnetization when interactions are included
We have shown that a twisted Janus dichalcogenide bilayer displays an electronic structure dominated by Rashba spin–orbit coupling effects
Summary
Dichalcogenide van der Waals materials [1,2,3,4,5,6] are paradigmatic two dimensional compounds featuring strong spin–orbit coupling effects [7,8,9,10,11,12,13]. Janus dichalcogenides feature an intrinsic mirror-symmetry breaking adding strong Rashba spin–orbit coupling effects [24,25,26] to the already rich physics of conventional dichalcogenides. We put forward twisted Janus systems (figure 1(a)) as a paradigmatic example in which correlated states emerge in flat bands dominated by spin-momentum texture in reciprocal space. We demonstrate the emergence of flat bands dominated by Rashba spin–orbit coupling effects in strike contrast with conventional twisted dichalcogenide systems.
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