Tunable Charge and Spin Dynamics in 2D Quantum Heterostructures

Two-dimensional (2D) van der Waals heterostructures, interfaces, and junctions provide new means for controlling charge and spin dynamics, as well as ordering phenomena [1]. Magnetic interfaces with 2D materials enable spin-resolved transmission and can also host nontrivial magnetic textures. Here, I introduce two observations. First, graphene, established for its exceptional spin communication [2], when interfaced with ferromangetic layers, enhances ultrafast demagnetization speeds in graphene spin field effect junctions [3] and ultrafast charge transfer in MoS₂-based van der Waals heterostructures [4]. Second, incorporating MoS₂ into a Cobalt|Platinum heterostructure introduces additive interfacial Dzyaloshinskii–Moriya interactions (DMI) from both the MoS₂/Co and Co/Pt interfaces. This additive DMI stabilizes chiral spin textures [5] and enables the observation of the topological Hall effect (THE) [6]. Our findings of interface-tuneable charge and spin dynamics in 2D heterostructures underscore their significance in advancing the performance and functionality of emergent spintronic and opto-spintronic devices.