Stimulated electron resonant tunneling into exciton states is investigated
within the pairing approximation and the interacting boson approximation. T
he tunneling current saturates at large densities due to the fermionic natu
re of exciton constituents. Conditions under which stimulated tunneling can
be observed experimentally are described. (C) 2000 Published by Elsevier S
cience B.V. All rights reserved.