  The familiar spin-1/2 quantum Heisenberg antiferromanget in a 2d square
lattice is shown, within the non linear sigma model approximations, to be
another novel state of matter that has excitations with fractional quantum
numbers above a finite energy gap. 1-skyrmion with an energy $\approx 2\pi J$
is shown to be made of two `deconfined spinons' or `SU(2) vortices'. The many
skyrmion operator and the wave functions that we have found are strikingly
similar to quantum Hall quasi particle operators and wave functions. We also
predict the presence of finite energy `spin-S spinon' for a general spin-S
Heisenberg antiferromagnets in 2d. Some consequences are briefly discussed.
