Quantum Hydrodynamics of Fractonic Superfluids with Lineon Condensate: from Navier-Stokes-like Equations to Landau-like Criterion

Understand

Fractonic superfluids are exotic states of matter with spontaneously broken higher-rank $U(1)$ symmetry.

• The latter is associated with conserved quantities that include not only particle number (i.e.
• charge) but also higher moments, such as dipoles, quadrupoles, and angular moments.
• Due to the presence of such conserved quantities, the mobility of particles is restricted either completely or partially.