Abstract
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.
Original language | English |
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Pages (from-to) | 927-933 |
Number of pages | 7 |
Journal | Nature Nanotechnology |
Volume | 15 |
Issue number | 11 |
DOIs | |
State | Published - 1 Nov 2020 |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Bioengineering
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering
- Biomedical Engineering
- General Materials Science