The Kondo effect in bosonic spin liquids

Abstract

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.

arXiv comment4 pages, 3 figures. The weak coupling RG flow was corrected and expanded in last version

References in corpus (9)

• Quantum criticality beyond the Landau-Ginzburg-Wilson paradigm
• Observation of extended scattering continua characteristic of spin fractionalization in the 2D frustrated quantum magnet Cs2CuCl4 by neutron scattering
• Atomic quantum dots coupled to BEC reservoirs
• Quantum Impurities in the Two-Dimensional Spin One-Half Heisenberg Antiferromagnet
• Quantum impurity dynamics in two-dimensional antiferromagnets and superconductors
• Universal Magnetic Properties of Frustrated Quantum Antiferromagnets in Two Dimensions
• Upper-critical dimension in a quantum impurity model: Critical theory of the asymmetric pseudogap Kondo problem
• Ordering in Cs2CuCl4: Is there a proximate spin liquid?
• The massive $C{P}^{N-1}$ model for frustrated spin systems

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