Quantum wires and quantum dots
QW are by now used in many commercial devices.
Why not try and confine electrons also in the other one or two
Quantum wires: etch selectively
with chemicals to create 1D structures.
Confinement effects need wires about
(1000 thinner than a hair).
It turns out that it is very difficult
(and expensive) to create 1D (wires)
and 0D (dots) structures on nm scale