Photonic Rashba effect from quantum emitters mediated by a Berry-phase defective photonic crystal
| Autor: | Elad Koren, Kexiu Rong, Avi Reuven, Elhanan Maguid, Bar Cohn, Shaul Katznelson, Vladimir Kleiner, Erez Hasman, Bo Wang |
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| Rok vydání: | 2020 |
| Předmět: |
Photoluminescence
Materials science Exciton Biomedical Engineering Physics::Optics Bioengineering Position and momentum space 02 engineering and technology 010402 general chemistry 01 natural sciences Condensed Matter::Materials Science General Materials Science Electrical and Electronic Engineering Photonic crystal business.industry Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics 0104 chemical sciences Geometric phase Quantum dot Optoelectronics Photonics 0210 nano-technology business Rashba effect |
| Zdroj: | Nature nanotechnology. 15(11) |
| ISSN: | 1748-3395 |
| Popis: | Heterostructures combining a thin layer of quantum emitters and planar nanostructures enable custom-tailored photoluminescence in an integrated fashion. Here, we demonstrate a photonic Rashba effect from valley excitons in a WSe2 monolayer, which is incorporated into a photonic crystal slab with geometric phase defects, that is, into a Berry-phase defective photonic crystal. This phenomenon of spin-split dispersion in momentum space arises from a coherent geometric phase pickup assisted by the Berry-phase defect mode. The valley excitons effectively interact with the defects for site-controlled excitation, photoluminescence enhancement and spin-dependent manipulation. Specifically, the spin-dependent branches of photoluminescence in momentum space originate from valley excitons with opposite helicities and evidence the valley separation at room temperature. To further demonstrate the versatility of the Berry-phase defective photonic crystals, we use this concept to separate opposite spin states of quantum dot emission. This spin-enabled manipulation of quantum emitters may enable highly efficient metasurfaces for customized planar sources with spin-polarized directional emission. |
| Databáze: | OpenAIRE |
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