| Autor: |
Jo K; Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.; Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States., Stevens CE; KBR Inc., Beavercreek, Ohio 45431, United States.; Sensors Directorate, Air Force Research Laboratory, Wright-Patterson AFB Ohio 45433, United States., Choi B; Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States., El-Khoury PZ; Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States., Hendrickson JR; Sensors Directorate, Air Force Research Laboratory, Wright-Patterson AFB Ohio 45433, United States., Jariwala D; Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States. |
| Abstrakt: |
Localized emission in atomically thin semiconductors has sparked significant interest as single-photon sources. Despite comprehensive studies into the correlation between localized strain and exciton emission, the impacts of charge transfer on nanobubble emission remains elusive. Here, we report the observation of core/shell-like localized emission from monolayer WSe 2 nanobubbles at room temperature through near-field studies. By altering the electronic junction between monolayer WSe 2 and the Au substrate, one can effectively adjust the semiconductor to metal junction from a Schottky to an Ohmic junction. Through concurrent analysis of topography, potential, tip-enhanced photoluminescence, and a piezo response force microscope, we attribute the core/shell-like emissions to strong piezoelectric potential aided by induced polarity at the WSe 2 -Au Schottky interface which results in spatial confinement of the excitons. Our findings present a new approach for manipulating charge confinement and engineering localized emission within atomically thin semiconductor nanobubbles. These insights hold implications for advancing the nano and quantum photonics with low-dimensional semiconductors. |
