Abstract

Trapped interlayer excitons (IXs) in MoSe₂-WSe₂ heterobilayers have generated interest for use as single quantum emitter arrays and as an opportunity to study moiré physics in transition metal dichalcogenide (TMD) heterostructures. IXs are spatially indirectly excitons comprised of an electron in the MoSe₂ layer bound to a hole in the WSe₂ layer. Previous reports of spectrally narrow (<1 meV) photoluminescence (PL) emission lines at low temperature have been attributed to IXs localized by the moiré potential between the TMD layers. Here, we show that spectrally narrow IX PL lines are present even when the moiré potential is suppressed by inserting a bilayer hexagonal boron nitride (hBN) spacer between the TMD layers. We directly compare the doping, electric field, magnetic field, and temperature dependence of IXs in a directly contacted MoSe₂-WSe₂ region to those in a region separated by bilayer hBN. Our results show that the localization potential resulting in the narrow PL lines is independent of the moiré potential, and instead likely due to extrinsic effects such as nanobubbles or defects. We show that while the doping, electric field, and temperature dependence of the narrow IX lines is similar for both regions, their excitonic g-factors have opposite signs, indicating that the IXs in the directly contacted region are trapped by both moiré and extrinsic localization potentials.

Abstract

Trapped interlayer excitons (IXs) in MoSe₂-WSe₂ heterobilayers have generated interest for use as single quantum emitter arrays and as an opportunity to study moiré physics in transition metal dichalcogenide (TMD) heterostructures. IXs are spatially indirectly excitons comprised of an electron in the MoSe₂ layer bound to a hole in the WSe₂ layer. Previous reports of spectrally narrow (<1 meV) photoluminescence (PL) emission lines at low temperature have been attributed to IXs localized by the moiré potential between the TMD layers. Here, we show that spectrally narrow IX PL lines are present even when the moiré potential is suppressed by inserting a bilayer hexagonal boron nitride (hBN) spacer between the TMD layers. We directly compare the doping, electric field, magnetic field, and temperature dependence of IXs in a directly contacted MoSe₂-WSe₂ region to those in a region separated by bilayer hBN. Our results show that the localization potential resulting in the narrow PL lines is independent of the moiré potential, and instead likely due to extrinsic effects such as nanobubbles or defects. We show that while the doping, electric field, and temperature dependence of the narrow IX lines is similar for both regions, their excitonic g-factors have opposite signs, indicating that the IXs in the directly contacted region are trapped by both moiré and extrinsic localization potentials.

Abstract

Trapped interlayer excitons (IXs) in MoSe₂-WSe₂ heterobilayers have generated interest for use as single quantum emitter arrays and as an opportunity to study moiré physics in transition metal dichalcogenide (TMD) heterostructures. IXs are spatially indirectly excitons comprised of an electron in the MoSe₂ layer bound to a hole in the WSe₂ layer. Previous reports of spectrally narrow (<1 meV) photoluminescence (PL) emission lines at low temperature have been attributed to IXs localized by the moiré potential between the TMD layers. Here, we show that spectrally narrow IX PL lines are present even when the moiré potential is suppressed by inserting a bilayer hexagonal boron nitride (hBN) spacer between the TMD layers. We directly compare the doping, electric field, magnetic field, and temperature dependence of IXs in a directly contacted MoSe₂-WSe₂ region to those in a region separated by bilayer hBN. Our results show that the localization potential resulting in the narrow PL lines is independent of the moiré potential, and instead likely due to extrinsic effects such as nanobubbles or defects. We show that while the doping, electric field, and temperature dependence of the narrow IX lines is similar for both regions, their excitonic g-factors have opposite signs, indicating that the IXs in the directly contacted region are trapped by both moiré and extrinsic localization potentials.

Abstract

Trapped interlayer excitons (IXs) in MoSe₂-WSe₂ heterobilayers have generated interest for use as single quantum emitter arrays and as an opportunity to study moiré physics in transition metal dichalcogenide (TMD) heterostructures. IXs are spatially indirectly excitons comprised of an electron in the MoSe₂ layer bound to a hole in the WSe₂ layer. Previous reports of spectrally narrow (<1 meV) photoluminescence (PL) emission lines at low temperature have been attributed to IXs localized by the moiré potential between the TMD layers. Here, we show that spectrally narrow IX PL lines are present even when the moiré potential is suppressed by inserting a bilayer hexagonal boron nitride (hBN) spacer between the TMD layers. We directly compare the doping, electric field, magnetic field, and temperature dependence of IXs in a directly contacted MoSe₂-WSe₂ region to those in a region separated by bilayer hBN. Our results show that the localization potential resulting in the narrow PL lines is independent of the moiré potential, and instead likely due to extrinsic effects such as nanobubbles or defects. We show that while the doping, electric field, and temperature dependence of the narrow IX lines is similar for both regions, their excitonic g-factors have opposite signs, indicating that the IXs in the directly contacted region are trapped by both moiré and extrinsic localization potentials.