3 papers
cond-mat.quant-gas2025
A steady solution to the hydrodynamic equation and incommensurate magnetization in a U(2) invariant superfluid
Guang-Xin Pang, Yi-Cai Zhang
At the zero temperature limit, a one-dimensional steady solution to the hydrodynamic equation of a U(2) invariant superfluid is obtained. This solution reveals that the magnitude o…
cond-mat.quant-gas2025
Double commutator method for a two band Bose-Einstein condensate: superfluid density of a flat band superfluid
Yi-Cai Zhang
In this work, we propose a double commutator method for a general two-band bosonic superfluid. First and foremost, we prove that the sum of the superfluid and normal densities is e…
cond-mat.quant-gas2024
Hydrodynamic equations for a U(N) invariant superfluid
Yi-Cai Zhang, Shizhong Zhang
In this paper, we develop the appropriate set of hydrodynamic equations in a U(N) invariant superfluid that couple the dynamics of superflow and magnetization. In the special case…