We report a clear evidence of bistability In the current-voltage chara
cteristics of p-i-n heterostructures containing InGaAs V-shaped quantu
m wires. The observed phenomenon is explained in the framework of a si
ngle carrier transport model in which the quantum wires act like traps
for the vertical current. The charge trapping phenomenon is indeed de
monstrated by temperature-dependent photocurrent experiments. (C) 1996
American Institute of Physics.