Multichannel Kondo screening in a one-dimensional correlated electron system
نویسندگان
چکیده
We study a multichannel one-dimensional (1D) supersymmetric t−J model with an added magnetic impurity of arbitrary spin S. The antiferromagnetic impurity-electron interaction is chosen so as to preserve integrability, allowing for an exact diagonalization of the model by a Bethe Ansatz. The solution reveals that interactions in the bulk make the magnetic impurity drive both spin and charge fluctuations, producing a mixed valence nimp 6= 0 at the impurity site with an associated effective spin Seff = S + |nimp|/2 in the presence of a magnetic field. Still, the screening of the impurity by unbound electrons is controlled by the relation between the number of available electron channels and the bare impurity spin, similar to the multichannel Kondo effect for free electrons. PACS numbers 75.20.Hr, 05.70.Jk, 71.27.+a
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