We show that the Gukov-Witten defects of supersymmetric Yang-Mills theory can be realized in perturbative string theory. This is done by considering an orbifold background of the Kanno-Tachikawa type and placing stacks of fractional D3-branes whose world-volume partially extends along the orbifold directions. In particular, we show that turning on a constant background value for some scalar fields in the closed string twisted sectors induces a non-trivial profile for the gauge field and one of the complex scalars of the world-volume theory. This profile exactly matches the singular behavior that one expects for a Gukov-Witten surface defect in the N=4 supersymmetric gauge theory.
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