Observation of photonic spin-momentum locking due to coupling of achiral metamaterials and quantum dots

Chiral interfaces provide a new platform to execute quantum control of light-matter interactions. One phenomenon which has emerged from engineering such nanophotonic interfaces is spin-momentum locking akin to similar reports in electronic topological materials and phases. While there are reports of...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2021-01, Vol.33 (1), p.015701-015701
Main Authors: Yadav, Ravindra Kumar, Liu, Wenxiao, Indukuri, S R K Chaitanya, Vasista, Adarsh B, Kumar, G V Pavan, Agarwal, Girish S, Basu, Jaydeep Kumar
Format: Article
Language:English
Subjects:
metamaterials
quantum dots
spin-momentum locking
topology
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Summary:Chiral interfaces provide a new platform to execute quantum control of light-matter interactions. One phenomenon which has emerged from engineering such nanophotonic interfaces is spin-momentum locking akin to similar reports in electronic topological materials and phases. While there are reports of spin-momentum locking with combination of chiral emitters and/or chiral metamaterials with directional far field excitation it is not readily observable with both achiral emitters and metamaterials. Here, we report the observation of photonic spin-momentum locking in the form of directional and chiral emission from achiral quantum dots (QDs) evanescently coupled to achiral hyperbolic metamaterials (HMM). Efficient coupling between QDs and the metamaterial leads to emergence of these photonic topological modes which can be detected in the far field. We provide theoretical explanation for the emergence of spin-momentum locking through rigorous modeling based on photon Green's function where pseudo spin of light arises from coupling of QDs to evanescent modes of HMM.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/abb650