Superluminal X-waves in a polariton quantum fluid View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2017-08-16

AUTHORS

Antonio Gianfrate, Lorenzo Dominici, Oksana Voronych, Michał Matuszewski, Magdalena Stobińska, Dario Ballarini, Milena De Giorgi, Giuseppe Gigli, Daniele Sanvitto

ABSTRACT

In this work, we experimentally demonstrate for the first time the spontaneous generation of two-dimensional exciton-polariton X-waves. X-waves belong to the family of localized packets that can sustain their shape without spreading, even in the linear regime. This allows the wavepacket to maintain its shape and size for very low densities and very long times compared to soliton waves, which always necessitate a nonlinearity to compensate the diffusion. Here, we exploit the polariton nonlinearity and uniquely structured dispersion, comprising both positive- and negative-mass curvatures, to trigger an asymmetric four-wave mixing in momentum space. This ultimately enables the self-formation of a spatial X-wave front. Using ultrafast imaging experiments, we observe the early reshaping of the initial Gaussian packet into the X-pulse and its propagation, even for vanishingly small densities. This allows us to outline the crucial effects and parameters that drive the phenomena and to tune the degree of superluminal propagation, which we found to be in close agreement with numerical simulations. More... »

PAGES

17119

References to SciGraph publications

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  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1038/lsa.2017.119

    DOI

    http://dx.doi.org/10.1038/lsa.2017.119

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1100347179

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/30839621


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