Researchers from the Chinese Academy of Sciences have experimentally demonstrated counterflow superfluidity (CSF) for the first time.
It is an exotic quantum state where two components (for example, different types of atoms or spins) flow in opposite directions with perfect correlation. Despite both components being superfluid, the system as a whole remains stationary and incompressible.
According to the researchers, CSF will be an important tool for studying and simulating complex quantum systems in ultracold environments, especially for exploring new quantum phases and spin-related phenomena.
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