P. Lefebvre et al., INFLUENCE OF SPIN-ORBIT SPLIT-OFF BAND ON OPTICAL-PROPERTIES OF SPHERICAL SEMICONDUCTOR NANOCRYSTALS - THE CASE OF CDTE, Solid state communications, 98(4), 1996, pp. 303-306
The multiband envelope-function formalism, including the effects of fi
nite spin-orbit splitting energy Delta, is used to calculate valence-b
and confined states in spherical semiconductor nanocrystallites. A com
pact analytical formulation of the necessary equations is proposed. In
the particular case of CdTe, despite the large value of Delta, the sp
lit-off band has a sizeable influence on the fundamental interband tra
nsition, which is found dipole-forbidden, by symmetry. This result can
not be accounted for by usual models in which the influence of the spl
it-off band is a priori neglected, when Delta is large. The consequenc
es of basic assumptions on this prediction, which should have importan
t consequences on intrinsic luminescence, are discussed.