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Title:
Detecting symmetry fractionalization by magnetic impurities
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Abstract:
We study the Kondo effect of magnetic impurities in gapped Z2 spin liquids. Using exactly solvable model and large-N mean-field theory, we demonstrate that certain symmetry fractionalization classes of the spinons will lead to a symmetry-protected non-Kramers degeneracy at the impurity location, after the Kondo screening of magnetic impurities takes place. We discuss how this phenomenon can be used to detect the symmetry fractionalization class of a topological order, and its associated experimental signatures.
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