On the electric activity of superfluid systems

The Keldysh theory of the superfluidity of a diluted electron-hole gas has been generalized to the case of the possible polarization of the pairs. It has been shown that the inhomogeneity of the system induces the dipole moment, which appears near the system boundaries and is proportional to the gradient of the particle density. It has been found that the quantized vortices in the magnetic field carry a real electric charge. The charge density in He II rotating at a rate of 10²s⁻¹ in a magnetic field of 10 T is about 10⁴ e cm⁻³, where e is the elementary charge.