An international group of physicists managed for the first time to experimentally observe the transition between two different states of matter: propagating polariton-solitons and a Bose-Einstein condensate.

Furthermore, physicists developed a theoretical model to explain such transitions and found a way to switch between the different states by changing the laser pumping power in the polariton formation process.

The results are published in Physical Review Letters.

Nonlinear systems are extensively studied in a wide range of physical systems, notably in photonics.

In such systems, interactions between particles lead to a whole range of novel effects such as nonlinear transitions between different basic states of matter including polaritons, solitons and Bose-Einstein condensates.

Once they are supplied with additional energy and densities, they form collective excitations, solitons.

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