Imaging strain-localized exciton states in nanoscale bubbles in monolayer WSe2 at room temperature
| Autor: | Takashi Taniguchi, Jeffrey W. Kysar, Nicholas J. Borys, Jenny Ardelean, Andrey Krayev, James Hone, Thomas Darlington, Matthias Florian, Christian Carmesin, Frank Jahnke, Kenji Watanabe, Emanuil Yanev, Obafunso Ajayi, P. James Schuck, Augusto Ghiotto, Abhay Pasupathy, Daniel Rhodes |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Photon
Materials science Exciton Biomedical Engineering FOS: Physical sciences Bioengineering 02 engineering and technology Crystal structure 010402 general chemistry 01 natural sciences Condensed Matter::Materials Science Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Monolayer General Materials Science Electrical and Electronic Engineering Spectroscopy Nanoscopic scale Quantum Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics 3. Good health 0104 chemical sciences Chemical physics 0210 nano-technology |
| Popis: | In monolayer transition metal dichalcogenides, quantum emitters are associated with localized strain that can be deterministically applied to create designer nano-arrays of single photon sources. Despite an overwhelming empirical correlation with local strain, the nanoscale interplay between strain, excitons, defects and local crystalline structure that gives rise to these quantum emitters is poorly understood. Here, we combine room-temperature nano-optical imaging and spectroscopy of excitons in nanobubbles of localized strain in monolayer WSe2 with atomistic structural models to elucidate how strain induces nanoscale confinement potentials that give rise to highly localized exciton states in 2D semiconductors. Nano-optical imaging of nanobubbles in low-defect monolayers reveal localized excitons on length scales of approximately 10 nm at multiple sites along the periphery of individual nanobubbles, which is in stark contrast to predictions of continuum models of strain. These results agree with theoretical confinement potentials that are atomistically derived from measured topographies of existing nanobubbles. Our results provide one-of-a-kind experimental and theoretical insight of how strain-induced confinement - without crystalline defects - can efficiently localize excitons on length scales commensurate with exciton size, providing key nanoscale structure-property information for quantum emitter phenomena in monolayer WSe2. 18 pages, 4 figures |
| Databáze: | OpenAIRE |
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