The electronic interaction of two different atomic sheets stacked together with a relative twist leads to a spatially periodic potential-energy landscape: the moiré superlattice. Here we will present magneto-optical spectroscopy of MoSe2/WSe2 heterobilayer devices with a small relative twist. We will discuss moiré-trapped inter-layer excitons, which can emit quantum light, and intra-layer excitons, which are sensitive to a large number of strongly correlated electron and hole states as a function of fractional filling.
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