  We propose that ordinary semiconductors with large spin-orbit coupling (SOC),
such as GaAs, can host stable, robust, and {\it tunable} topological states in
the presence of quantum confinement and superimposed potentials with hexagonal
symmetry. We show that the electronic gaps which support chiral spin edge
states can be as large as the electronic bandwidth in the heterostructure
miniband. The existing lithographic technology can produce a topological
insulator (TI) operating at temperature $10- 100K$. Improvement of lithographic
techniques will open way to tunable room temperature TI.
