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In van der Waals heterostructures (HS) consisting of stacked MoSe$_2$ andWSe$_2$ monolayers, optically bright interlayer excitons (ILE) can be observedwhen the constituent layers are crystallographically aligned. The symmetry ofthe monolayers allows for two different types of alignment, in which themomentum-direct interlayer transitions are either valley-conserving (R-typealignment) or changing the valley index (H-type anti-alignment). Here, we studythe valley polarization dynamics of ILE in magnetic fields up to 30~Tesla bytime-resolved photoluminescence (PL). For all ILE types, we find a finiteinitial PL circular degree of polarization ($DoP$) after unpolarized excitationin applied magnetic fields. For ILE in H-type HS, we observe a systematicincrease of the PL $DoP$ with time in applied magnetic fields, which saturatesat values close to unity for the largest fields. By contrast, for ILE in R-typeHS, the PL $DoP$ shows a decrease and a zero crossing before saturating withopposite polarization. This unintuitive behavior can be explained by a modelconsidering the different ILE states in H- and R-type HS and their selectionrules coupling PL helicity and valley polarization.

Interlayer exciton valley polarization dynamics in large magnetic fields