Author/Authors :
R Cingolani، نويسنده , , M.De Giorgi، نويسنده , , R Rinaldi، نويسنده , , H Lipsanen، نويسنده , , M Sopanen، نويسنده , , R Virkkala، نويسنده , , K Maijala، نويسنده , , J Tulkki، نويسنده , , J Ahopelto، نويسنده , , K Uchida، نويسنده , , N Miura، نويسنده , , Y Arakawa، نويسنده ,
Abstract :
The influence of the direct and exchange Coulomb interaction on Landau level formation in strain-induced quantum dots (QD) has been studied by high-field (45 T) magneto-luminescence and by many-electron–many-hole Hartree–Fock calculations. The Darwin–Fock states of the dots are found to merge into a single Landau level at very high fields with a considerable reduction in the total diamagnetic shift due to the enhanced electron–hole correlation caused by the increased degeneracy of the state. We calculate a 50% reduction of the diamagnetic shift as a result of direct and exchange Coulomb interaction in the squeezed carrier states, in excellent agreement with the experimental findings.
