  This letter reports on a search for hypothetical heavy neutrinos, N, and
right-handed gauge bosons, WR, in events with two high transverse momentum
leptons and at least one high transverse momentum hadronic jet. The results
were obtained from data corresponding to an integrated luminosity of 2.1 fb^-1
collected in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS
detector at the CERN Large Hadron Collider. No excess above the Standard Model
background expectation is observed. Excluded mass regions for Majorana and
Dirac neutrinos are presented using two approaches for interactions that
violate lepton and lepton-flavour numbers. One approach uses an effective
operator framework, the other approach is guided by the Left-Right Symmetric
Model. The results described in this letter represent the most stringent limits
to date on the masses of heavy neutrinos and WR bosons obtained in direct
searches.
