  We investigate the quantum phase transition from antiferromagnetism ($AF$) to
algebraic spin liquid ($ASL$). {\it We propose that spin 1/2 fermionic spinons
in the $ASL$ fractionalize into spin 1/2 bosonic spinons and spinless fermions
at the quantum critical point ($QCP$) between the $AF$ and the $ASL$}.
Condensation of the bosonic spinons leads to the $AF$, where the condensed
bosonic spinons are confined with the spinless fermions to form the fermionic
spinons. These fermionic spinons are also confined to make antiferromagnons as
elementary excitations in the $AF$. {\it Approaching the $QCP$ from the $AF$,
spin 1 critical antiferromagnetic fluctuations are expected to break up into
spin 1/2 critical bosonic spinons. Then, these bosonic spinons hybridize with
spin 1/2 fermionic spinons, making spinless fermions}. As a result the
fermionic spinons decay into the bosonic spinons and the spinless fermions.
But, the spinless fermions are confined and thus, only the bosonic spinons
emerge at the $QCP$. This coincides with the recent studies of {\it deconfined
quantum
criticality}\cite{Laughlin_deconfinement,Senthil_deconfinement,Kim1,Ichinose_de
confinement}. When the bosonic spinons are gapped, the $ASL$ is realized. The
bosonic spinons are confined with the spinless fermions to form the fermionic
spinons. These fermionic spinons are deconfined to describe the $ASL$.
