The Kondo effect in bosonic spin liquids

Details The Kondo effect in bosonic spin liquids The Kondo effect in bosonic spin liquids

2005-07-07

arxiv.org/abs/cond-mat/0507188v5

Phys. Rev. Lett 96, 036601 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures. The weak coupling RG flow was corrected and expanded in last version

Scientific paper

10.1103/PhysRevLett.96.036601

In a metal, a magnetic impurity is fully screened by the conduction electrons at low temperature. In contrast, impurity moments coupled to spin-1 bulk bosons, such as triplet excitations in paramagnets, are only partially screened, even at the bulk quantum critical point. We argue that this difference is not due to the quantum statistics of the host particles but instead related to the structure of the impurity-host coupling, by demonstrating that frustrated magnets with bosonic spinon excitations can display a bosonic version of the Kondo effect. However, the Bose statistics of the bulk implies distinct behavior, such as a weak-coupling impurity quantum phase transition, and perfect screening for a range of impurity spin values. We discuss implications of our results for the compound Cs2CuCl4, as well as possible extensions to multicomponent bosonic gases.

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