Magnetoexcitons in coupled quantum wells

Excitons in coupled quantum wells with spatially separated electrons (e) and holes (h) in a high transverse magnetic field (H) are considered, The exciton energies are calculated for various Landau levels and arbitrary interwell separations (D). The change of parameter D/l (where l = root HBARc/eH) leads to a reconstruction of the exciton dispersion laws E(P) (P is the conserved ''magnetic'' momentum of the magnetoexciton, being proportional to the mean distance between e and h along the wells). Noncentral (''roton'') extrema exist only for interlayer separations D/l smaller than the critical one (the latter depends on exciton quantum numbers), Impurity states in CQWs are also calculated.