Quantum fluids of light in all-optical scatterer lattices
| Autor: | Sergey Alyatkin, Julian D. Töpfer, Pavlos G. Lagoudakis, Helgi Sigurdsson, Alexis Askitopoulos |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Quantum fluid
Phase transition Science Exciton FOS: Physical sciences Physics::Optics General Physics and Astronomy Polaritons 01 natural sciences General Biochemistry Genetics and Molecular Biology Article 010305 fluids & plasmas Lattice (order) Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Polariton 010306 general physics Electronic band structure Physics Condensed Matter::Quantum Gases Multidisciplinary Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Condensed Matter::Other Bose-Einstein condensates General Chemistry Reflection (physics) Matter wave |
| Zdroj: | Nature Communications Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021) |
| ISSN: | 2041-1723 |
| Popis: | 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. Semiconductor microcavities allow engineering of artificial lattices with optical write-in and read-out of information. Here, the authors show an optically imprinted system of exciton-polaritons arranged in a Lieb lattice and reveal a nonequilibrium transition from scattered- to trapped polariton condensates. |
| Databáze: | OpenAIRE |
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