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Compact spin-valley-locked perovskite emission
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- Chen, Yang (författare)
- Natl Univ Singapore, Singapore; Univ Sci & Technol China, Peoples R China,Chinese Academy of Sciences Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, People’s Republic of China ; Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore
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- Feng, Jiangang (författare)
- Nanyang Technol Univ, Singapore; Natl Univ Singapore, Singapore,Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore ; Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore
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- Huang, Yuqing (författare)
- Linköpings universitet,Elektroniska och fotoniska material,Tekniska fakulteten,Nanyang Technol Univ, Singapore,Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore,Functional Electronic Materials
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- (creator_code:org_t)
- 2023
- 2023
- Engelska.
- Ingår i: Nature Materials. - : NATURE PORTFOLIO. - 1476-1122 .- 1476-4660.
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- Circularly polarized light sources with free-space directional emission play a key role in chiroptics(1), spintronics(2), valleytronics(3) and asymmetric photocatalysis(4). However, conventional approaches fail to simultaneously realize pure circular polarization, high directionality and large emission angles in a compact emitter. Metal-halide perovskite semiconductors are promising light emitters(5-8), but the absence of an intrinsic spin-locking mechanism results in poor emission chirality. Further, device integration has undermined the efficiency and directionality of perovskite chiral emitters. Here we realize compact spin-valley-locked perovskite emitting metasurfaces where spin-dependent geometric phases are imparted into bound states in the continuum via Brillouin zone folding, and thus, photons with different spins are selectively addressed to opposite valleys. Employing this approach, chiral purity of 0.91 and emission angle of 41.0 degrees are simultaneously achieved, with a beam divergence angle of 1.6 degrees. With this approach, we envisage the realization of chiral light- emitting diodes, as well as the on-chip generation of entangled photon pairs.
Ämnesord
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- Chen, Yang
- Feng, Jiangang
- Huang, Yuqing
- Chen, Weijin
- Su, Rui
- Ghosh, Sanjib
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- Hou, Yi
- Xiong, Qihua
- Qiu, Cheng-Wei
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