Gaussian quantum dots of type II in in‐plane electric field

The growing interest is recently focusing on QDs of type II, which contrary to type I QDs attract electrons and repulse holes (or conversely). In such QDs an electron–hole pair ( X exciton) can still be traped due to electron–hole Coulomb attraction, resulting in significantly more complex structure of excitonic states. We consider an X exciton in QD of type II defined by electrostatic focusing in a narrow quantum well, in the presence of additional external in‐plane electric field. The dependence of PL spectrum on dot size and in‐plane electric field is analysed within the Hartree approach for model planar Gaussian confinement. The exciton ground state and its energy red‐shift are found as a function of electric field and dot size. Corresponding rearrangement of PL spectrum is described. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)