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This research demonstrates how nuclear quantum fluctuations can induce gas-like transport properties in liquid helium-4 at ultra-low temperatures, effectively defining a second Frenkel line. The findings challenge conventional models of fluid dynamics by showing that high quantum dispersion leads to superdiffusion and ultralow viscosity without the presence of superfluidity. These insights advance our fundamental understanding of quantum liquids and their phase transitions under extreme conditions.

Source coveringQuantum Zeitgeist

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Quantum Fluctuations Drive Liquid Helium’s Unexpected Shift

Quantum ZeitgeistJuly 31, 20264 min read

New simulations reveal how quantum fluctuations drive a shift in liquid helium-4, creating a gas-like state at temperatures as low as 0.1 K. This unexpected behavior contrasts with conventional liquid dynamics.

Researchers at Nara Women’s University have revealed a surprising shift in the behavior of liquid helium-4, demonstrating a transition between two distinct liquid states over a temperature range of 0.1, 3.3 K and a pressure range of 1, 60 bar. Mika Tanabe, Momoko Tsujimoto, and Kenichi Kinugawa identify a transport crossover marked by simultaneous minima in shear and kinematic viscosities, thermal conductivity, and thermal diffusivity as the liquid transforms from a low quantum-dispersion liquid (LQDL) to a high…

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