ElectronicTransport inModulation-doped α-RuCl₃

The layered Mott insulator α-RuCl₃ is a prominent candidate to host a quantum spin liquid phase. Recently, we found that monolayer graphene donates 4∗10¹³ electrons/cm² to α-RuCl₃when the two materials are placed in direct contact. The charge transfer persists, though to a lesser extent, even when the two materials are spatially separated by a thin insulating spacer, which realizes modulation doping of the α-RuCl₃. In light of models for high-Tc superconductivity based on charge-doped Mott insulators, we are motivated to explore the electronic transport of charge-doped α-RuCl₃samples. We fabricate van der Waals heterostructures comprising thin flakes of α-RuCl₃, modulation-doped by graphene across a thin insulating spacer, and also contacted by graphene leads. We will present results of electronic transport in these devices as a function of electron doping, temperature, and magnetic field.