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arXiv · 0912.3881

Magnetic impurities in the honeycomb Kitaev model

Kusum Dhochak·R. Shankar·V. Tripathi
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Abstract

We study the effect of coupling magnetic impurities to the honeycomb lattice spin-1/2 Kitaev model in its spin liquid phase. We show that a spin-S impurity coupled to the Kitaev model is associated with an unusual Kondo effect with an intermediate coupling unstable fixed point K_c J/S separating topologically distinct sectors of the Kitaev model. We also show that the massless spinons in the spin liquid mediate an interaction of the form S_{iα}^{2}S_{jβ}^{2}/R_{ij}^{3} between distant impurities unlike the usual dipolar RKKY interaction S_{iα}S_{jα}/R_{ij}^{3} noted in various 2D impurity problems with a pseudogapped density of states of the spin bath. Furthermore, this long-range interaction is possible only if the impurities (a) couple to more than one neighboring spin on the host lattice and (b) the impurity spin is not a spin-1/2.$

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Kusum Dhochak, R. Shankar, V. Tripathi. 2010-09-20. Magnetic impurities in the honeycomb Kitaev model. https://doi.org/10.1103/physrevlett.105.117201

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