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We show that a magnetic field perpendicular to an AlGaAs/GaAs coupled quantumwell efficiently traps dipolar excitons and leads to the stabilization of theexcitonic formation and confinement in the illumination area. Hereby, thedensity of dipolar excitons is remarkably enhanced up to $\sim 10^{11}cm^{-2}$. By means of Landau level spectroscopy we study the density of excessholes in the illuminated region. Depending on the excitation power and theapplied electric field, the hole density can be tuned over one order ofmagnitude up to $\sim 2.5$ $10^{11} cm^{-2}$ - a value comparable with typicalcarrier densities in modulation-doped structures.

Forming and confining of dipolar excitons by quantizing magnetic fields