Chapter 4 Properties of nanomaterials

EXCITONIC EFFECTS IN QUANTUM WELLS
(a), In which the Bohr radius of the exciton is
much smaller than the quantum well width,
and the one in (b), for which the width of the
well is smaller than aB.
Exciton binding energy as a func;on of the
quantum well width.
(a) Exciton orbits in a very bulk crystal;
(b) the spherical form of the exciton
becomes elongated when the width of
the QW is smaller than the exciton
radius.
Binding energies for holes in a GaAs–AlGaAs
quantum well as a func;on of well width.
Aver [5].