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Quantum fluids of light in all-optical scatterer lattices

Quantum fluids of light in all-optical scatterer lattices

Title: Quantum fluids of light in all-optical scatterer lattices
Author: Alyatkin, S.
Sigurðsson, Helgi
Askitopoulos, A.
Töpfer, J. D.
Lagoudakis, P. G.
Date: 2021-09-22
Language: English
Department: Science Institute
Series: Nature Communications; 12(1)
ISSN: 2041-1723
DOI: https://doi.org/10.1038/s41467-021-25845-4
Subject: Þéttefnisfræði; Skammtafræði; Chemistry (all); Biochemistry, Genetics and Molecular Biology (all); Physics and Astronomy (all)
URI: https://hdl.handle.net/20.500.11815/2707

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Alyatkin , S , Sigurðsson , H , Askitopoulos , A , Töpfer , J D & Lagoudakis , P G 2021 , ' Quantum fluids of light in all-optical scatterer lattices ' , Nature Communications , vol. 12 , no. 1 , 5571 . https://doi.org/10.1038/s41467-021-25845-4


One of the recently established paradigms in condensed matter physics is examining a system’s behaviour in artificial potentials, giving insight into phenomena of quantum fluids in hard-to-reach settings. A prominent example is the matter-wave scatterer lattice, where high energy matter waves undergo transmission and reflection through narrow width barriers leading to stringent phase matching conditions with lattice band formation. In contrast to evanescently coupled lattice sites, the realisation of a scatterer lattice for macroscopic matter-wave fluids has remained elusive. Here, we implement a system of exciton-polariton condensates in a non-Hermitian Lieb lattice of scatterer potentials. By fine tuning the lattice parameters, we reveal a nonequilibrium phase transition between distinct regimes of polariton condensation: a scatterer lattice of gain guided polaritons condensing on the lattice potential maxima, and trapped polaritons condensing in the potential minima. Our results pave the way towards unexplored physics of non-Hermitian fluids in non-stationary mixtures of confined and freely expanding waves.


Funding Information: We acknowledge the support of the UK’s Engineering and Physical Sciences Research Council (grant EP/M025330/1 on Hybrid Polaritonics). S.A. acknowledges the support of the Russian Science Foundation (RSF) grant No. 21-72-00088. H.S. and P.G.L acknowledge support by the European Union’s Horizon 2020 programme, through a FET Open research and innovation action under the grant agreement No. 899141 (PoLLoC). Publisher Copyright: © 2021, The Author(s).

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