Andreev reflection is widely used in practical applications, such as on chip coolers and thermometers at very low temperatures, as well as a powerful tool in experiments with superconductors and fermionic superfluid ${}^3\mathrm{He}\text{−}B$, where it has been used to study quantum turbulence. Although superfluid ${}^4\mathrm{He}$ is the bosonic superfluid, its dispersion relation displays features similar to that of ${}^3\mathrm{He}\text{−}B$, especially at high pressures approaching the solidification pressure, where the roton energy gap vanishes. We discuss an analog of Andreev reflection in superfluid ${}^4\mathrm{He}$ and suggest experiments of using it for detection of quantum turbulence.

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• Andreev reflection
• Superfluidity
• Quantum fluids & solids