Disorder in a quantum spin liquid: flux binding and local moment formation

Details Disorder in a quantum spin liquid: flux binding and local moment formation Disorder in a quantum spin liquid: flux binding and local moment formation

2010-03-29

arxiv.org/abs/1003.5502v1

Phys. Rev. Lett. 104, 237203 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.104.237203

We study the consequences of disorder in the Kitaev honeycomb model, considering both site dilution and exchange randomness. We show that a single vacancy binds a flux and induces a local moment. This moment is polarised by an applied field $h$: in the gapless phase, for small $h$ the local susceptibility diverges as $\chi(h)\sim\ln(1/h)$; for a pair of nearby vacancies on the same sublattice, this even increases to $\chi(h)\sim1/(h[\ln(1/h)]^{3/2})$. By contrast, weak exchange randomness does not qualitatively alter the susceptibility but has its signature in the heat capacity, which in the gapless phase is power law in temperature with an exponent dependent on disorder strength.

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