  We propose a scheme to actively cool the fundamental flexural (out-of-plane)
mode of a graphene sheet via vacuum forces. Our setup consists in a cold atom
cloud placed close to a graphene sheet at distances of a few micrometers. The
atoms couple to the graphene membrane via Casimir-Polder forces. By deriving a
self-consistent set of equations governing the dynamics of the atomic gas and
the flexural modes of the graphene, we show to be possible to cool graphene
from room temperatures by actively (laser) cooling an atomic gas. By choosing
the right set of experimental parameter we are able to cool a graphene sheet
down to ~ 60 microkelvin.
