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We explore the low-energy dynamics of 1/2-BPS heavy particles coupled to theABJM model via the Higgsing of M2-branes, with focus on physical understandingof the recently discovered 1/2-BPS Wilson loop operators. The low-energy theoryof 1/2-BPS heavy particles turns out to have the U(N|N) supergauge symmetry,which explains the novel structure of the 1/2-BPS Wilson loop operator as aholonomy of a U(N|N) superconnection. We show that the supersymmetrictransformation of the Wilson loop operator can be identified as a fermionicsupergauge transformation, which leads to their invariance under half of thesupersymmetry. We also argue that 1/2-BPS Wilson loop operators appear as1/2-BPS vortices with vorticity 1/k. Such a vortex can be naturally interpretedas a membrane wrapping the Z_k cycle once, or type IIA fundamental string.

1/2-BPS Wilson Loops and Vortices in ABJM Model