Long-range spin transport in a system of indirect excitons in van der Waals MoSe₂ /WSe₂ heterostructure

Excitons in 2D van der Waals transition-metal dichalcogenide (TMD) heterostructures are characterized by high binding energies and determine optical properties of TMD heterostructures. Spatially indirect excitons (IXs), also known as interlayer excitons, are composed of electrons and holes in separated layers. TMD heterostructures are characterized by strong moiré superlattice potentials for IXs [1,2]. The long IX lifetimes make possible IX transport over long distances. In this contribution, we present the observation of a long-range spin transport in a system of IXs in MoSe₂ /WSe₂ heterostructure. The spin transport decay distance reaches and exceeds 100 microns. We measured the range of parameters, including the exciton density and temperature, of the long-range spin transport.