title: Exciton supersolidity in hybrid Bose-Fermi systems.
abstract: We investigate the ground states of a Bose-Einstein condensate of indirect excitons coupled to an electron gas. We show that in a properly designed system the crossing of a roton minimum into the negative energy domain can result in the appearance of the supersolid phase, characterized by periodicity in both real and reciprocal space. Accounting for the spin-dependent exchange interaction of excitons we obtain ferromagnetic supersolid domains. The Fourier spectra of excitations of weakly perturbed supersolids show pronounced diffraction maxima which may be detected experimentally.
authors.affiliation: Instytut Fizyki PAN, Warsaw, Poland.
authors.forename: Michał
authors.initials: M
authors.lastname: Matuszewski
authors.forename: Thomas
authors.initials: T
authors.lastname: Taylor
authors.forename: Alexey V
authors.initials: AV
authors.lastname: Kavokin