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My research interests have been the development and study of novel low dimensional materials (2D van der Waal heterostructures) through building atomically-thin-Lego from graphene, molybdenum disulfide (MoS2) and other similar van der Waals materials for highly sensitive photodetection and quantum sensing applications e.g. number resolved single photon detection etc.
Our experimental investigations have confirmed that the electrical property of one van der Waals material (graphene, bilayer-graphene) can be combined with the optical property of the other van der Waals material (molybdenum disulphide (MoS2)) by physically stacking these together and forming heterostructures (Nature Nanotechnology 8, 826-830 (2013)). Irrespective of the nanoscale thickness (< 10 nm), such combination allows achieving extremely large photoresponsivity which is not observed in conventional photo-sensitive materials/devices. Our recent results with bilayer-graphene-MoS2 heterostructures show that such devices can be operated as number-resolved single photon detectors (Advanced Materials, In press (October-2017)).
In collaboration with Paria et al., we have also demonstrated that nanostructure of dimers can be used to enhance light matter interaction in a monolayer graphene leading high photoresponsivity (Advanced Materials 27, 1751-1758 (2015)).