  Dipolar bosonic gases are currently the focus of intensive research due to
their interesting many-body physics in the quantum regime. Their experimental
embodiments range from Rydberg atoms to GaAs double quantum wells and van der
Waals heterostructures built from transition metal dichalcogenides. Although
quantum gases are very dilute, mutual interactions between particles could lead
to exotic many-body phenomena such as Bose-Einstein condensation and
high-temperature superfluidity. Here, we report the effect of repulsive dipolar
interactions on the dynamics of interlayer excitons in the dilute regime. By
using spatial and time-resolved photoluminescence imaging, we observe the
dynamics of exciton transport, enabling a direct estimation of the exciton
mobility. The presence of interactions significantly modifies the diffusive
transport of excitons, effectively acting as a source of drift force and
enhancing the diffusion coefficient by one order of magnitude. The repulsive
dipolar interactions combined with the electrical control of interlayer
excitons opens up appealing new perspectives for excitonic devices.
