Fig. 1: Schematic of the sample and spatially resolved IX photoluminescence.
From: Localized interlayer excitons in MoSe2–WSe2 heterostructures without a moiré potential
a Cartoon depiction of the device shows the WSe2–MoSe2 heterostructure encapsulated with hBN. Bilayer graphene is used for the top gate and graphite is used for the bottom gate. Approximately half of the TMD heterostructure is separated by bilayer hBN to suppress the moiré potential. b Confocal PL spatial map of this device, plotting the average center IX photon energy. The hBN separated region is shown in blue with 1.37 to 1.44 eV IX emission energy and the direct contact area is shown in red with the emission energy between 1.28 and 1.36 eV. c Co- and cross-circularly polarized PL spectra measured by exciting the hBN separated region with a polarized 1.72 eV laser and collecting from both regions at the same time. The signal from the hBN separated region ~1.42 eV is mostly co-polarized, whereas the signal from the DC region ~1.33 eV is mostly cross-polarized.
