Superluminal X-waves in a polariton quantum fluid

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

doi:10.1038/lsa.2017.119

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Superluminal X-waves in a polariton quantum fluid

Original Articles

- Superluminal X-waves in a polariton quantum fluid
- Light: Science & Applications Vol. 7, Issue 1, (2018)
- Affiliations：
  
  1.CNR NANOTEC, Istituto di Nanotecnologia, Via Monteroni, 73100 Lecce, Italy
  2.Institute of Theoretical Physics and Astrophysics, University of Gdańsk, ul. Wita Stwosza 57, 80-952 Gdańsk, Poland
  3.Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
  4.Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
  5.INFN, sezione di Lecce, 73100 Lecce, Italy
- Author bio：
  
  L Dominici, Email: lorenzo.dominici@gmail.com
- Funds：
- DOI：10.1038/lsa.2017.119
  CLC：
- Published：2018，
  
  Published Online：12 January 2018，
  
  Received：29 May 2017，
  
  Revised：03 August 2017，
  
  Accepted：09 August 2017
- Accepted：
Scan QR Code
Gianfrate, A. et al. Superluminal X-waves in a polariton quantum fluid. Light: Science & Applications, 7, 17119 (2018).
DOI：

Gianfrate, A. et al. Superluminal X-waves in a polariton quantum fluid. Light: Science & Applications, 7, 17119 (2018). DOI： 10.1038/lsa.2017.119.

摘要

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.

关键词

Keywords

negative massnonlinearitypolaritonssuperluminalX-waves

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