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A new form of superfluidity, taking place in the presence of vortex bundles, has recently been discovered in fluids made of light.ÌýIn a recent study published in PRL, researchers from the "Quantum Collective Dynamics in Light Matter Systems" led by Prof. M. Szymanska in °×С½ãÂÛ̳, found strong evidence for a novel unconventional quantum phase. Such a phase can be created in quantum fluids of light -- a state of matter, where the elementary particle is the result of combining light and electrons inside a semiconductor.ÌýIt has been shown earlier that this system is a superfluid, a particular quantum fluid that flows without friction. Dr. Paolo Comaron, a co-author of this research, adds: "Standard superfluidity can exist only in the absence of vortices with the exception of tightly bound vortex pairs. The system considered in this work, instead, exhibits a new type of superfluid phase that survives the presence of bundles of many vortices. The explanation of this phenomenon relies on the multi-component nature of this fluid, and how these components interact."Ìý

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Dagvadorj, G., P. Comaron, and M. H. SzymaÅ„ska. "Unconventional Berezinskii-Kosterlitz-Thouless Transition in the Multicomponent Polariton System."ÌýPhysical Review LettersÌý130.13 (2023): 136001. DOI:10.1103/PhysRevLett.130.136001