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Low-temperature Depletion of Superfluid Density in the Absence of Galilean Symmetry
Viktor Berger, Nikolay Prokof'ev, Boris Svistunov
Landau theory of superfluidity associates low-temperature flow of the normal component with the phonon wind. This picture does not apply to superfluids in which Galilean invariance…
cond-mat.quant-gas2025
"Depletion" of Superfluid Density: Universal Low-temperature Thermodynamics of Superfluids
Viktor Berger, Nikolay Prokof'ev, Boris Svistunov
In a Galilean superfluid, the depletion of superfluid density with rising temperature can be attributed to thermally excited non-interacting phonons. For systems without Galilean s…