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Compact spin-valley-locked perovskite emission
Natl Univ Singapore, Singapore; Univ Sci & Technol China, Peoples R China.
Nanyang Technol Univ, Singapore; Natl Univ Singapore, Singapore.
Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering. Nanyang Technol Univ, Singapore.
Natl Univ Singapore, Singapore.
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2023 (English)In: Nature Materials, ISSN 1476-1122, E-ISSN 1476-4660Article in journal (Refereed) Epub ahead of print
Abstract [en]

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.

Place, publisher, year, edition, pages
NATURE PORTFOLIO , 2023.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-193698DOI: 10.1038/s41563-023-01531-2ISI: 000975989600002PubMedID: 37081172OAI: oai:DiVA.org:liu-193698DiVA, id: diva2:1756944
Note

Funding Agencies|National Natural Science Foundation of China [62275241, 12020101003, 92250301]; State Key Laboratory of Low-Dimensional Quantum Physics at Tsinghua University; Nanyang Technological University via a Nanyang Assistant Professorship start-up grant; Singapore Ministry of Education via the AcRF Tier 3 programme Geometrical Quantum Materials [MOE2018-T3-1-002]; National University of Singapore (NUS) Presidential Young Professorship [A-0009174-03-00, A-0009174-02-00]; SERIS - NUS; National Research Foundation Singapore (NRF); Energy Market Authority of Singapore (EMA); Singapore Economic Development Board (EDB); National Research Foundation, Prime Ministers Office, Singapore [NRF-CRP22-2019-0006]; Advanced Research and Technology Innovation Centre (ARTIC), NUS [R-261-518-004-720|A-0005947-16-00]; Knut and Alice Wallenberg Foundation (KAW)

Available from: 2023-05-15 Created: 2023-05-15 Last updated: 2023-05-15

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