  We propose an efficient mechanism to realize an invisible axion from a low
scale Peccei-Quinn symmetry breaking. Our basic model only contains a gauge
boson, an up-type vector-like quark, two Higgs doublets and two Higgs singlets
besides the standard model fermions and gauge bosons. The physical Peccei-Quinn
global symmetry is a result of two independent global symmetries connected by
the new gauge symmetry. Anyone of these two global symmetries only acts on
either the right-handed top quark or the left-handed new quark so that it can
avoid the domain wall problem. Thanks to the electroweak and new gauge
interactions, the Higgs doublet for the top quark mass generation and the Higgs
singlet for the new quark mass generation can only contribute a tiny fraction
in the axion. The axion decay constant can be largely enhanced by a factor
composed of the vacuum expectation values of the four Higgs scalars.
