Screening of static perturbation in a system of dipole excitons

The screening of local electrostatic perturbation by indirect excitons has been investigated. It has been shown that the linear screening is dielectric, and the effective dielectric constant may be large in the case of high degeneracy of the Bose gas of excitons. The emergence of a condensate significantly changes the behavior of the perturbation potential at infinity, leading to power-law asymptotic behavior with large exponents. In the nonlinear regime, the screened potential is saturated with an unlimited increase in the initial perturbation.