A boundary impurity in the spin-1/2 XX chain maps to two Majorana chains, yielding two-channel Kondo physics with impurity entropy ln√2 and a critical coupling at J=√2.
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Two Channel Kondo behavior in the quantum XX chain with a boundary defect
A boundary impurity in the spin-1/2 XX chain maps to two Majorana chains, yielding two-channel Kondo physics with impurity entropy ln√2 and a critical coupling at J=√2.