Moiré Engineering of Spin-Orbit Coupling in Twisted Platinum Diselenide

Abstract

We study the electronic structure and correlated phases of twisted bilayers of platinum diselenide using large-scale ab initio simulations combined with the functional renormalization group. PtSe${}_2$ is a group-X transition metal dichalcogenide, which hosts emergent flat bands at small twist angles in the twisted bilayer. Remarkably, we find that moiré engineering can be used to tune the strength of Rashba spin-orbit interactions, altering the electronic behavior in a novel manner. We reveal that an effective triangular lattice with a twist-controlled ratio between kinetic and spin-orbit coupling scales can be realized. Even dominant spin-orbit coupling can be accessed in this way and we discuss consequences for the interaction driven phase diagram, which features pronounced exotic superconducting and entangled spin-charge density waves.

arXiv comment13 pages, 4 figures

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• Reference results for the momentum space functional renormalization group
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• divERGe implements various Exact Renormalization Group examples
• Better Integrators for Functional Renormalization Group Calculations
• Chern number landscape of spin-orbit coupled chiral superconductors
• Chiral magnetic phases in Moire bilayers of magnetic dipoles
• Functional renormalization of spinless triangular-lattice fermions: $N$-patch vs. truncated-unity scheme
• Surface Functional Renormalization Group for Layered Quantum Materials