ELECTRON-HOLE TRANSITIONS BETWEEN STATES WITH NONZERO ANGULAR MOMENTA IN THE MAGNETOLUMINESCENCE OF QUANTUM DOTS

Photoluminescence studies on InGaAs/GaAs quantum dots with diameters down to 20 nm have been performed in magnetic fields up to B=12 T and have been compared to detailed calculations. The eigenstates of these cylindrical dots are characterized by a radial quantum number and an azimuthal quantum number corresponding to the orbital angular momentum. From the distinctly different magnetic field dependences of the several transitions we identify electron-hole recombinations involving states with 0, ±1, and-2 values of the angular momentum. © 1995 The American Physical Society.