Forming and confining of dipolar excitons by quantizing magnetic fields

Details Forming and confining of dipolar excitons by quantizing magnetic fields Forming and confining of dipolar excitons by quantizing magnetic fields

2010-09-02

arxiv.org/abs/1009.0427v3

Physical Review B 83, 081307(R) (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4.3 Pages, 4 Figures

Scientific paper

10.1103/PhysRevB.83.081307

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

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