  We explore routes to realize electrically driven Bose-Einstein condensation
of magnons in insulating antiferromagnets. Even in insulating antiferromagnets,
the localized spins can strongly couple to itinerant spins in adjacent metals
via spin-transfer torque and spin pumping. We describe the formation of
steady-state magnon condensates controlled by a spin accumulation polarized
along the staggered field in an adjacent normal metal. Two types of magnons
exist in antiferromagnets, which carry opposite magnetic moments. Consequently,
and in contrast to ferromagnets, Bose-Einstein condensation can occur for
either sign of the spin accumulation. This condensation may occur even at room
temperature when the interaction with the normal metal is fast compared to the
relaxation processes within the antiferromagnet. In antiferromagnets, the
operating frequencies of the condensate are orders of magnitude faster than in
ferromagnets.
