Noncontact atomic force microscopy and density functional theory studies of the (2*2) reconstructions of the polar AlN(0001) surface

This work is supported by the European Commission within the projects AtMol (Contract No. ICT-270028) and PAMS (Contract No. ICT-610446). Part of the calculation was performed using High Performance Computing resources from the Calcul in Midi-Pyrenees (CALMIP) facilities (Grant No. 2011-[P0832]).