Data archive of "Emergence of radial Rashba spin-orbit fields in twisted van der Waals heterostructures"

Rashba spin-orbit coupling is a quintessential spin interaction appearing in virtually any electronic heterostructure. Its paradigmatic spin texture in the momentum space forms a tangential vector field. Using first-principles investigations, we demonstrate that in twisted homobilayers and hetero-multilayers, the Rashba coupling can be predominantly radial, parallel to the momentum. Specifically, we study four experimentally relevant structures: twisted bilayer graphene (Gr), twisted bilayer WSe2, and twisted multilayers WSe2/Gr/WSe2 and WSe2/Gr/Gr/WSe2. We show, that the Rashba spin-orbit field texture in such structures can be controlled by an electric field, allowing to tune it from radial to tangential. Such spin-orbit engineering should be useful for designing novel spin-charge conversion and spin-orbit torque schemes, as well as for controlling correlated phases and superconductivity in van der Waals materials.

Rashba自旋-轨道耦合作为一种典型的自旋相互作用，几乎存在于所有电子异质结构中。其在动量空间中的典范自旋纹理构成了一个切向矢量场。通过第一性原理的研究，我们证实，在扭曲同质层和异质多层结构中，Rashba耦合可以主要表现为径向形式，与动量平行。具体而言，我们研究了四种与实验相关的结构：扭曲双层石墨烯（Gr）、扭曲双层WSe2，以及扭曲多层WSe2/Gr/WSe2和WSe2/Gr/Gr/WSe2。我们发现，这些结构中的Rashba自旋-轨道场纹理可以通过电场进行调控，从而实现从径向到切向的转变。此类自旋-轨道工程对于设计新颖的自旋-电荷转换和自旋-轨道扭矩方案，以及控制范德华材料中的关联相和超导性具有重要意义。