  We provide a route to generate nematic order in a spin-1/2 system. Unlike the
well-known magnon-binding mechanism, our spin nematics requires neigher the
frustration effect nor a spin polarization in a high field or in the vicinity
of a ferromagnet, but instead appears next to the spin singlet phase. We start
from a state consisting of a quantum spin-1/2 singlet dimer placed on each site
of a triangular lattice, and show that inter-dimer ring exchange interactions
efficiently dope the SU(2) triplets that itinerate and interact, easily driving
a stable singlet state to either Bose Einstein condensates or a triplet
crystal, some hosting a spin nematic order. A variety of roles the ring
exchange serves include the generation of a bilinear-biquadratic interaction
between nearby triplets, which is responsible for the emergent nematic order
separated from the singlet phase by a first order transition.
