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The ABJM theory refers to superconformal Chern-Simons-matter theory withproduct gauge group U(L)xU(R) and level +k, -k, respectively. The theory is acandidate for worldvolume dynamics of M2-branes sitting at C(4)/Z(k)k. Byutilizing monopole operators, we prove that ABJM theory gets enhanced N=8supersymmetry and SO(8) R-symmetry at Chern-Simons levels k=1,2. We first showthat the ABJM Lagrangian can be written in a manifestly SO(8) invariant form upto certain extra terms. We then show that upon integrating out Chern-Simonsgauge fields these extra terms vanish precisely at levels k=1,2. Utilizingmonopole operators at these levels, we identify new N=2 supersymmetry. Wedemonstrate that they combine with the manifest N=6 supersymmetry to closeon-shell on N=8 supersymmetry. We finally show that the ABJM scalar potentialis SO(8) invariant.

Enhanced N=8 Supersymmetry of ABJM Theory on R(8) and R(8)/Z(2)